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Teachings. Teachings on the nature of apostolic succession vary depending on the ecclesiastic body, especially within various Protestant denominations. Christians of the Catholic Church, Church of the East, Oriental Orthodox, and the Eastern Orthodox Church teach apostolic succession. Among the previously mentioned churches opinions vary as to the validity of succession within Old Catholic, Lutheran, Anglican and Moravian communities. Catholic Church. In Catholic theology, the doctrine of apostolic succession is that the apostolic tradition – including apostolic teaching, preaching, and authority – is handed down from the college of apostles to the college of bishops through the laying on of hands, as a permanent office in the Church. Historically, this has been understood as a succession in office, a succession of valid ordinations, or a succession of the entire college. It is understood as a sign and guarantee that the Church, both local and universal, is in diachronic continuity with the apostles; a necessary but insufficient guarantor thereof.
Papal primacy is different though related to apostolic succession as described here. The Catholic Church has traditionally claimed a unique leadership role for the Apostle Peter, believed to have been named by Jesus as head of the Apostles and as a focus of their unity, who became the first Bishop of Rome, and whose successors inherited the role and accordingly became the leaders of the worldwide Church as well. Even so, Catholicism acknowledges the papacy is built on apostolic succession, not the other way around. As such, apostolic succession is a foundational doctrine of authority in the Catholic Church. Peter was succeeded by Linus, Linus by Clement, Clement by Anacletus, Anacletus by Evaristus..." The Catholic position is summarised this way: "The Lord says to Peter: 'I say to you,' he says, 'that you are Peter, and upon this rock I will build my Church, and the gates of hell will not overcome it ...' On him [Peter] he builds the Church, and to him he gives the command to feed the sheep, and although he assigns a like power to all the apostles, yet he founded a single chair [cathedra], and he established by his own authority a source and an intrinsic reason for that unity... If someone [today] does not hold fast to this unity of Peter, can he imagine that he still holds the faith? If he [should] desert the chair of Peter upon whom the Church was built, can he still be confident that he is in the Church?"
Catholicism holds that Christ entrusted the Apostles with the leadership of the community of believers, and the obligation to transmit and preserve the "deposit of faith". The experience of Christ and his teachings contained in the doctrinal tradition handed down from the time of the apostles and the written portion, which is Scripture. The apostles then passed on this office and authority by ordaining bishops to follow after them. Catholic theology holds that the apostolic succession affects the power and authority to administer the sacraments except for baptism and matrimony. Baptism may be administered by anyone and matrimony by the couple to each other. Authority to so administer such sacraments is passed on only through the sacrament of Holy Orders, a rite by which a priest is ordained. Ordination can be conferred only by bishop. The bishop must be from an unbroken line of bishops stemming from the original apostles selected by Jesus Christ. Thus, apostolic succession is necessary for the valid celebration of the sacraments.
Views concerning other churches. In the Catholic Church, Pope Leo XIII stated in his 1896 bull "Apostolicae curae" that the Catholic Church believes specifically that Anglican orders were to be considered "absolutely null and utterly void". His argument was as follows. First, the ordination rite of Edward VI had removed the language of a sacrificial priesthood. Ordinations using this new rite occurred for over a century and, because the restoration of the language of "priesthood" a century later in the ordination rite "was introduced too late, as a century had already elapsed since the adoption of the Edwardine Ordinal ... the Hierarchy had become extinct, there remained no power of ordaining." With this extinction of validly ordained bishops in England, "the true Sacrament of Order as instituted by Christ lapsed, and with it the hierarchical succession." As a result, the pope's final judgment was that Anglican ordinations going forward were to be considered "absolutely null and utterly void". Anglican clergy were from then on to be ordained as Catholic priests upon entry into the Catholic Church.
A reply from the Archbishops of Canterbury and York (1896) was issued to counter Pope Leo's arguments: "Saepius officio: Answer of the Archbishops of Canterbury and York to the Bull Apostolicae Curae of H. H. Leo XIII". They argued that if the Anglican orders were invalid, then the Roman orders were as well since the Pope based his case on the fact that the Anglican ordinals used did not contain certain essential elements but these were not found in the early Roman rites either. Catholics argue, this argument does not consider the sacramental intention involved in validating Holy Orders. In other words, Catholics believe that the ordination rites were reworded so as to invalidate the ordinations because the intention behind the alterations in the rite was a fundamental change in Anglican understanding of the priesthood. It is Catholic doctrine that the teaching of "Apostolicae curae" is a truth to be "held definitively, but are not able to be declared as divinely revealed", as stated in a commentary by the Congregation for the Doctrine of the Faith. Cardinal Basil Hume explained the conditional character of his ordination of Graham Leonard, former Anglican bishop of the Diocese of London, to the priesthood in the following way: "While firmly restating the judgement of "Apostolicae Curae" that Anglican ordination is invalid, the Catholic Church takes account of the involvement, in some Anglican episcopal ordinations, of bishops of the Old Catholic Church of the Union of Utrecht who are validly ordained. In particular and probably rare cases the authorities in Rome may judge that there is a 'prudent doubt' concerning the invalidity of priestly ordination received by an individual Anglican minister ordained in this line of succession."
At the same time, he stated: "Since the church must be in no doubt of the validity of the sacraments celebrated for the Roman Catholic community, it must ask all who are chosen to exercise the priesthood in the Catholic Church to accept sacramental ordination in order to fulfill their ministry and be integrated into the apostolic succession." Since "Apostolicae curae" was issued many Anglican jurisdictions have revised their ordinals, bringing them more in line with ordinals of the early Church. Timothy Dufort, writing in "The Tablet" in 1982, attempted to present an ecumenical solution to the problem of how the Catholic Church might accept Anglican orders without needing to formally repudiate "Apostolicae curae" at all. Dufort argued that by 1969 all Anglican bishops had acquired apostolic succession fully recognized by Rome, since from the 1930s Old Catholic bishops (the validity of whose orders the Vatican has never questioned) have acted as co-consecrators in the ordination of Anglican bishops. This view has not yet been considered formally by the Holy See, but after Anglican Bishop Graham Leonard converted to Catholicism, he was only reordained in 1994 because of the presence of Old Catholic bishops at his ordination.
The question of the validity of Anglican orders has been further complicated by the Anglican ordination of women. In a document it published in July 1998, the Congregation for the Doctrine of the Faith stated that the Catholic Church's declaration on the invalidity of Anglican ordinations is a teaching that the church has definitively propounded and that therefore every Catholic is required to give "firm and definitive assent" to this matter. This being said, in May 2017, Cardinal Francesco Coccopalmerio, President of the Pontifical Council for Legislative Texts, has asked whether the current Catholic position on invalidity could be revised in the future. Eastern Orthodox. While Eastern Orthodox sources often refer to the bishops as "successors of the apostles" under the influence of Scholastic theology, strict Orthodox ecclesiology and theology hold that all legitimate bishops are properly successors of Peter. This also means that presbyters (or "priests") are successors of the apostles. As a result, Eastern Orthodox theology makes a distinction between a geographical or historical succession and proper ontological or ecclesiological succession. Hence, the bishops of Rome and Antioch can be considered successors of Peter in a historical sense on account of Peter's presence in the early community. This does not imply that these bishops are more successors of Peter than all others in an ontological sense.
The Eastern Orthodox have often permitted non-Eastern Orthodox clergy to be rapidly ordained within Orthodoxy as a matter of pastoral necessity and economia. Priests entering Eastern Orthodoxy from Oriental Orthodoxy and Catholicism have usually been received by "vesting" and have been allowed to function immediately within Eastern Orthodoxy as priests. Recognition of Catholic orders by the Russian Orthodox Church was stipulated in 1667 by the Synod of Moscow, but this position is not universal within the Eastern Orthodox communion. For example, Fr. John Morris of the Antiochian Orthodox Christian Archdiocese of North America, states that "Apostolic Succession is not merely a historical pedigree, but also requires Apostolic Faith. This is because Apostolic Succession is not the private possession of a bishop, but is the attribute of a local Church. A bishop who goes in schism or is cast out of office due to heresy does not take his Apostolic Succession with him as a private possession." The validity of a priest's ordination is decided by each autocephalous Eastern Orthodox church.
In 1922 the Eastern Orthodox Ecumenical Patriarch of Constantinople recognised Anglican orders as valid, holding that they carry "the same validity as the Roman, Old Catholic and Armenian churches possess". In the encyclical "From the Oecumenical Patriarch to the Presidents of the Particular Eastern Orthodox churches", Meletius IV of Constantinople, the Ecumenical Patriarch, wrote: "That the Orthodox theologians who have scientifically examined the question have almost unanimously come to the same conclusions and have declared themselves as accepting the validity of Anglican Orders." Following this declaration, in 1923, the Greek Orthodox Patriarchate of Jerusalem, as well as the Greek Orthodox Church of Cyprus agreed by "provisionally acceding that Anglican priests should not be re-ordained if they became Orthodox"; in 1936, the Romanian Orthodox Church "endorsed Anglican Orders". Succeeding judgements have been more conflicting. The Eastern Orthodox churches require a totality of common teaching to recognise orders and in this broader view find ambiguities in Anglican teaching and practice problematic. Accordingly, in some parts of the Eastern Orthodox Church, Anglican clergy who convert to Orthodoxy are reordained, rather than vested.
There are also historic instances of canonically disputed or unrecognized clergy being recognized and/or received into the Eastern Orthodox churches without need for conditional ordination (e.g., Joseph Zuk of the Ukrainian Orthodox Church of the USA, Alexander Turner of the Antiochian Western Rite Vicariate, and Christopher Contogeorge of the Greek Orthodox Archdiocese of America, and Greek Orthodox Patriarchate of Alexandria). Oriental Orthodox Churches. The Armenian Apostolic Church, which is one of the Oriental Orthodox churches, recognises Catholic episcopal consecrations without qualification. Lutheran churches. Lutherans universally believe that "no one should publicly teach in the Church or administer the Sacraments unless he be regularly called". The Lutheran churches in Scandinavia, and those established in other parts of the world as a result of Scandinavian Lutheran missionary activity (such as the Evangelical Lutheran Church in Kenya), practice "episcopal" succession in which the bishop whose holy orders can be traced back for centuries performs ordinations. On the other hand, certain Lutheran theologians, such as Arthur Carl Piepkorn, have held to the conception of a succession of presbyters in contradistinction to a succession of bishops. German Lutheran churches and their subsequent offspring in the United States practice succession of presbyters in which another priest is the one who confers the priesthood onto another. This low view results from the Prussian state-ordered union with Reformed (Calvinist) churches in 1817.
Lutheran claims to apostolic succession. In Scandinavia and the Baltic region, Lutheran churches participating in the Porvoo Communion (those of Iceland, Norway, Sweden, Finland, Estonia, and Lithuania), as well as non-Porvoo membership Lutheran churches in the region (including those of Latvia, and Russia), and the confessional Communion of Nordic Lutheran Dioceses, believe that they ordain their bishops in apostolic succession in lines stemming from the original apostles. "The New Westminster Dictionary of Church History" states that "In Sweden the apostolic succession was preserved because the Catholic bishops were allowed to stay in office, but they had to approve changes in the ceremonies." The Lutheran Church of Finland was at that time one with the Church of Sweden and so holds the same view regarding the see of Åbo/Turku.
Negotiated at Järvenpää, Finland, and inaugurated with a celebration of the Eucharist at Porvoo Cathedral in 1992, the Porvoo Communion agreement of unity includes the mutual recognition of the traditional apostolic succession among the following churches: At least one of the Scandinavian Lutheran churches in the Porvoo Communion of churches, the Church of Denmark has bishops, but strictly speaking they were not in the historic apostolic succession prior to their entry into the Porvoo Communion, since their episcopate and holy orders derived from Johannes Bugenhagen, who was a pastor, not a bishop. In 2010, the Church of Denmark joined the Porvoo Communion of churches, after a process of mutual consecrations of bishops had led to the introduction of historic apostolic succession. The Lutheran Church in Great Britain also joined the Porvoo Agreement, in 2014. In Scandinavia, where High Church Lutheranism and Pietist Lutheranism has been highly influential, the Evangelical Lutheran Mission Diocese of Finland, Mission Province of the Church of Sweden, and the Evangelical Lutheran Diocese of Norway entered into schism with their national churches due to "the secularization of the national/state churches in their respective countries involving matters of both Christian doctrine and ethics"; these have altar and pulpit fellowship through the Communion of Nordic Lutheran Dioceses and are members of the confessional International Lutheran Council with their bishops having lines of apostolic succession from other traditional Lutheran Churches, such as the Evangelical Lutheran Church in Kenya.
Similarly, in the High Church Lutheranism of Germany, some religious brotherhoods such as Hochkirchliche St. Johannes-Bruderschaft and Hochkirchlicher Apostolat St. Ansgar have managed to arrange for their own bishop to be re-ordained in apostolic succession. The members of these brotherhoods do not form into separate ecclesia. The Evangelical Lutheran Church in America, North America's largest Lutheran body, gained apostolic succession through Lutheran bishops in the historic episcopate; this allowed for full communion with the Episcopal Church in 2000, upon the signing of "Called to Common Mission". By this document the full communion between the Evangelical Lutheran Church in America and the Episcopal Church was established. As such, "all episcopal installations in the Evangelical Lutheran Church in America take place with the participation of bishops in the apostolic succession." The Evangelical Lutheran Church in America is headed by a presiding bishop who is elected by the churchwide assembly for a six-year term.
The Evangelical Catholic Church, a Lutheran denomination of Evangelical Catholic churchmanship based in North America, taught: A number of Lutheran churches of the Evangelical Catholic and High Church Lutheran churchmanship based in the United States of America possess apostolic succession, with lineage generally being from the Independent Catholic churches. These include: Indifference to the issue. Many German Lutherans appear to demur on this issue, which may be sourced in the church governance views of Martin Luther. Luther's reform movement usually did not abrogate the ecclesiastic office of bishop. An important historical context to explicate the difference regarding apostolic succession among between the Scandinavian Lutheran churches and the German Lutheran churches is the Prussian Union of 1817, whereby the civil government directed the Lutheran churches in Prussia to merge with non-Lutheran Reformed Churches in Prussia. The Reformed (Calvinist) churches generally oppose on principle the traditional doctrine of ecclesiastic Apostolic Succession, e.g., not usually even recognising the church office of bishop.
Later in the 19th century, other Lutheran and Reformed congregations merged to form united church bodies in some of the other 39 states of the German Confederation, e.g., in Anhalt, Baden, Bremen, Hesse and Nassau, Hesse-Kassel and Waldeck, and the Palatinate. Yet the partial nature of this list also serves to show that in Germany there remained many Lutherans who never united with the Reformed. Other Lutheran churches are indifferent as a matter of doctrine regarding this particular issue of ecclesiastical governance. In America, the conservative Lutheran Church–Missouri Synod (LCMS) places its church authority in the congregation rather than in the bishop, and ordinations are typically performed by another pastor, although its founder, C. F. W. Walther, while establishing congregational polity for the LCMS, considered polity (a church's form of government) to be a matter of adiaphora (something indifferent). Anglican Communion. The Anglican Communion "has never officially endorsed any one particular theory of the origin of the historic episcopate, its exact relation to the apostolate, and the sense in which it should be thought of as God given, and in fact tolerates a wide variety of views on these points". Its claim to apostolic succession is rooted in the Church of England's evolution as part of the Western Church. Apostolic succession is viewed not so much as conveyed mechanically through an unbroken chain of the laying-on of hands, but as expressing continuity with the unbroken chain of commitment, beliefs and mission starting with the first apostles; and as hence emphasising the enduring yet evolving nature of the Church.
When Henry VIII broke away from the jurisdiction of Rome in 1533/4, the English Church () claimed the episcopal polity and apostolic succession inherent in its Catholic past. Reformed theology gained a certain foothold, and under his successor, Edward VI what had been an administrative schism – as the Church under Henry was separated from Rome but remained essentially Catholic in its theology and practice – became a reformation under the guiding hand of Thomas Cranmer. Although care was taken to maintain the unbroken sequence of episcopal consecrations – particularly in the case of Matthew Parker, who was consecrated Archbishop of Canterbury in 1559 by two bishops who had been ordained in the 1530s with the Roman Pontifical and two ordained with the Edwardine Ordinal of 1550 – apostolic succession was not seen as a major concern that a true ministry could not exist without episcopal consecrations: English Reformers such as Richard Hooker rejected the Roman position that Apostolic Succession is divinely commanded or necessary for true Christian ministry. American Episcopal theologian Richard A. Norris argues that the ""foreign" Reformed [Presbyterian] churches" were genuine ones despite the lack of apostolic succession because they had been abandoned by their bishops at the Reformation.
In very different ways both James II and William III of England made it plain that the Church of England could no longer count on the 'godly prince' to maintain its identity and traditions and the 'High Church' clergy of the time began to look to the idea of apostolic succession as a basis for the church's life. For William Beveridge (Bishop of St Asaph, 1704–8) the importance of this lay in the fact that Christ himself is "continually present at such imposition of hands; thereby transferring the same Spirit, which He had first breathed into His Apostles, upon others successively after them", but the doctrine did not really come to the fore until the time of the Tractarians. In 1833, before his conversion to Catholicism, Newman wrote about the apostolic succession: "We must necessarily consider none to be ordained who has not been ordained". After quoting this, Michael Ramsey continues: "With romantic enthusiasm, the Tractarians propagated this doctrine. In doing so they involved themselves in some misunderstandings of history and in some confusion of theology". He explained that they ascribed to early Anglican authors a far more exclusive version of the doctrine than was the case. They blurred the distinction between succession in office (Irenaeus) and succession in consecration (Augustine). They spoke of apostolic succession as the channel of grace in a way that failed to do justice to His gracious activity within all the dispensations of the New Covenant.
J. B. Lightfoot argued that monarchial episcopacy evolved upwards from a college of presbyters by the elevation of one of their number to be the episcopal president. A.C. Headlam laid great stress on Irenaeus' understanding of succession which had been lost from sight behind the Augustinian 'pipe-line theory'. Methodist churches. In the beginnings of the Methodist movement, adherents were instructed to receive the sacraments within the Anglican Church since the Methodists were still a movement and not as yet a separate church in England until 1805. The American Methodists soon petitioned to receive the sacraments from the local preachers who conducted worship services and revivals. The Bishop of London refused to ordain Methodist priests and deacons in the British American colonies. John Wesley, the founder of the movement, was reluctant to allow unordained preachers to administer the sacraments: Some scholars argue that in 1763, Greek Orthodox bishop Erasmus of the Diocese of Arcadia, who was visiting London at the time, consecrated John Wesley a bishop, and ordained several Methodist lay preachers as priests, including John Jones. According to these arguments, Wesley could not openly announce his episcopal consecration without incurring the penalty of the Præmunire Act. In light of Wesley's alleged episcopal consecration, the Methodist Church could lay claim on apostolic succession, as understood in the traditional sense. Since John Wesley "ordained and sent forth every Methodist preacher in his day, who preached and baptized and ordained, and since every Methodist preacher who has ever been ordained as a Methodist was ordained in this direct 'succession' from Wesley, then the Methodist Church teaches that it has all the direct merits coming from apostolic succession, if any such there be."
Most Methodists view apostolic succession outside its high church sense. This is because Wesley believed that the offices of bishop and presbyter constituted one order, citing an ancient opinion from the Church of Alexandria; Jerome, a Church Father, wrote: "For even at Alexandria from the time of Mark the Evangelist until the episcopates of Heraclas and Dionysius the presbyters always named as bishop one of their own number chosen by themselves and set in a more exalted position, just as an army elects a general, or as deacons appoint one of themselves whom they know to be diligent and call him archdeacon. For what function, excepting ordination, belongs to a bishop that does not also belong to a presbyter?" (Letter CXLVI). John Wesley thus argued that for two centuries the succession of bishops in the Church of Alexandria, which was founded by Mark the Evangelist, was preserved through ordination by presbyters alone and was considered valid by that ancient Church. Since the Bishop of London refused to ordain ministers in the British American colonies, this constituted an emergency and as a result, on 2 September 1784, Wesley, along with a priest from the Anglican Church and two other elders, operating under the ancient Alexandrian habitude, ordained Thomas Coke a superintendent, although Coke embraced the title bishop.
Today, the United Methodist Church follows this ancient Alexandrian practice as bishops are elected from the presbyterate: the "Discipline of the Methodist Church", in ¶303, affirms that "ordination to this ministry is a gift from God to the Church. In ordination, the Church affirms and continues the apostolic ministry through persons empowered by the Holy Spirit." It also uses sacred scripture in support of this practice, namely, 1 Timothy 4:14, which states: The Methodist Church also buttresses this argument with the leg of sacred tradition of the Wesleyan Quadrilateral by citing the Church Fathers, many of whom concur with this view. In addition to the aforementioned arguments – or perhaps instead of them – in 1937 the annual Conference of the British Methodist Church located the "true continuity" with the Church of past ages in "the continuity of Christian experience, the fellowship in the gift of the one Spirit; in the continuity in the allegiance to one Lord, the continued proclamation of the message; the continued acceptance of the mission;..." [through a long chain which goes back to] "the first disciples in the company of the Lord Himself ... This is our doctrine of apostolic succession" [which neither depends on, nor is secured by,] "an official succession of ministers, whether bishops or presbyters, from apostolic times, but rather by fidelity to apostolic truth".
The Church of North India, Church of Pakistan and Church of South India are members of the World Methodist Council and the clergy of these three united Protestant churches possess lines of apostolic succession, according to the Anglican understanding of this doctrine, through the Church of India, Burma and Ceylon (CIBC), which finished merging with these three in the 1970s. In June 2014, the Church of Ireland, a province of the Anglican Communion, extended its lines of apostolic succession into the Methodist Church in Ireland, as "the Archbishop of Dublin and Bishop of Down and Dromore took part in the installation of the new President of the Methodist Church of Ireland, the Rev. Peter Murray." In May 2014, the "Church of Ireland's General Synod approved an agreement signed with the Methodist Church that provided for the interchangeability of clergy, allowing an ordained minister of either church to come under the discipline and oversight of the other." Hussite Church and Moravian Church. The Moravian Church, as with the Hussite Church, teaches the doctrine of apostolic succession. The Moravian Church claims apostolic succession as a legacy of the old Unity of the Brethren. In order to preserve the succession, three Bohemian Brethren were consecrated bishops by Bishop Stephen of Austria, a Waldensian bishop who had been ordained by a Catholic bishop in 1434. These three consecrated bishops returned to Litice in Bohemia and then ordained other brothers, thereby preserving the historic episcopate.
Presbyterian/Reformed churches. "Jus Divinum Regiminis Ecclesiastici" (English translation: The Divine Right of Church Government), which was promulgated by Presbyterian clergy in 1646, holds that historic ministerial succession is necessary for legitimate ministerial authority. It states that ministerial succession is conferred by elders through the laying on of hands, in accordance with Timothy 4:14. The Westminster Assembly held that "There is one general church visible" and that "every minister of the word is to be ordained by imposition of hands, and prayer, with fasting, by those preaching presbyters to whom it doth belong". The Church of North India, Church of Pakistan and Church of South India are members of the World Alliance of Reformed Churches and the clergy of these three united Protestant churches possess lines of apostolic succession, according to the Anglican understanding of this doctrine, through the Church of India, Burma and Ceylon (CIBC), which finished merging with these three in the 1970s.
Pentecostal churches. On 6 February 2003, K. J. Samuel, the moderator bishop of the Church of South India (a United Protestant denomination that holds membership worldwide Anglican Communion in addition to the World Communion of Reformed Churches), along with P.M. Dhotekar, bishop of Nagpur of the Church of North India, and Bancha Nidhi Nayak, bishop of Phulbani of the Church of North India, consecrated Pentecostal minister K. P. Yohannan as a bishop in Anglican lines of apostolic succession; K.P. Yohannan thereafter became the first metropolitan of the Believers Eastern Church, a Pentecostal denomination which acquired an episcopal polity of ecclesiastical governance. Many other Pentecostal Christians teach that "the sole guarantor of apostolic faith, which includes apostolic life, is the Holy Spirit." In addressing the Church of God General Assembly, Ambrose Jessup Tomlinson stated that "Although we do not claim a line of succession from the holy apostles, we do believe we are following in their example." Latter Day Saint movement.
Denominations within the Latter Day Saint movement preach the necessity of apostolic succession and claim it through the process of restoration. According to their teaching, a period of universal apostasy followed the death of the Twelve Apostles. Without apostles or prophets left on the earth with the legitimate Priesthood Authority, many of the true teachings and practices of Christianity were lost. Eventually these were restored to the prophet Joseph Smith and various others in a series of divine conferrals and ordinations by angelic men who had held this authority during their lifetimes ("see this partial list of restoration events"). As it relates to apostolic succession, Joseph Smith and Oliver Cowdery said that the apostles Peter, James, and John appeared to them in 1829 and conferred upon them the Melchizedek Priesthood and with it "the keys of the kingdom, and of the dispensation of the fullness of times". For the Church of Jesus Christ of Latter-day Saints (LDS Church), the largest denomination in the Latter-day Saint movement, Apostolic Succession involves the leadership of the church being established through the Quorum of the Twelve Apostles. Each time the President of the Church dies, the most senior apostle, who is designated as the President of the Quorum of the Twelve Apostles, is set apart as the new church president.
Criticism. Some Protestants, particularly those in the Calvinist tradition, deny the doctrine of apostolic succession, believing that it is neither taught in Scripture nor necessary for Christian teaching, life, and practice. Accordingly, these Protestants strip the notion of apostolic succession from the definition of "apostolic" or "apostolicity". For them, to be apostolic is simply to be in submission to the teachings of the original twelve apostles as recorded in Scripture. This doctrinal stance reflects the Protestant view of authority, embodied in the doctrine known as Sola Scriptura. Among the first who rejected the doctrine of apostolic succession was John Calvin. He said that the episcopacy was inadequate to address corruption, doctrinal or otherwise, and that this inadequacy justified the intervention of the church of lay people. Some Protestants feel that such claims of apostolic succession are proven false by the differences in traditions and doctrines between these churches: Roman Catholics and Eastern Orthodox consider both the Church of the East and the Oriental Orthodox churches to be heretical, having been anathematized in the early ecumenical councils of Ephesus (431) and Chalcedon (451) respectively. Churches that claim apostolic succession in ministry distinguish this from doctrinal orthodoxy, holding that "it is possible to have valid orders coming down from the apostles, and yet not to have a continuous spiritual history coming down from the apostles".
All Christians who have a genuine relationship with God through and in Christ are part of the "true Church", according to evangelical Protestant theology, notwithstanding condemnation of the Catholic Church by some Protestants. The propriety of the Church as a temporal institution deriving its legitimacy from apostolic succession is greatly diminished under this theological view. Certain parts of Confessional Lutheranism. Parts of Confessional Lutheranism have retained apostolic succession, such as the Mission Province (Missionsprovinsen), Evangelical Lutheran Church of Ingria and Evangelical Lutheran Church in Kenya, for example (see Lutheran churches); these are members of the International Lutheran Council. Certain other Confessional Lutheran churches including Wisconsin Evangelical Lutheran Synod (WELS) and Lutheran Church – Missouri Synod (LCMS) reject Apostolic Succession as a biblical doctrine. These churches teach that the Bible contains no evidence showing that the office must be conveyed by laying-on of hands and no Biblical command that it must be by a special class of bishops. The Wisconsin Evangelical Lutheran Synod teaches that there is no evidence the Popes have historic succession from Peter other than their own claim that it is so.
The Wisconsin Synod acknowledges: However, the Synod states that there are a number of major problems with this Roman Catholic view on apostolic succession: WELS holds that it's their custom that ordination of pastors is by other pastors, and that neither the Bible nor the Lutheran confessions make this the only divinely mandated way of entering the pastoral ministry: "It is the call of the church that is the essential element, more specifically, the call of Christ through the church."
Chemistry of ascorbic acid Ascorbic acid is an organic compound with formula , originally called hexuronic acid. It is a white solid, but impure samples can appear yellowish. It dissolves freely in water to give mildly acidic solutions. It is a mild reducing agent. Ascorbic acid exists as two enantiomers (mirror-image isomers), commonly denoted "" (for "levo") and "" (for "dextro"). The isomer is the one most often encountered: it occurs naturally in many foods, and is one form ("vitamer") of vitamin C, an essential nutrient for humans and many animals. Deficiency of vitamin C causes scurvy, formerly a major disease of sailors in long sea voyages. It is used as a food additive and a dietary supplement for its antioxidant properties. The "" form (erythorbic acid) can be made by chemical synthesis, but has no significant biological role. History. The antiscorbutic properties of certain foods were demonstrated in the 18th century by James Lind. In 1907, Axel Holst and Theodor Frølich discovered that the antiscorbutic factor was a water-soluble chemical substance, distinct from the one that prevented beriberi. Between 1928 and 1932, Albert Szent-Györgyi isolated a candidate for this substance, which he called "hexuronic acid", first from plants and later from animal adrenal glands. In 1932 Charles Glen King confirmed that it was indeed the antiscorbutic factor.
In 1933, sugar chemist Walter Norman Haworth, working with samples of "hexuronic acid" that Szent-Györgyi had isolated from paprika and sent him in the previous year, deduced the correct structure and optical-isomeric nature of the compound, and in 1934 reported its first synthesis. In reference to the compound's antiscorbutic properties, Haworth and Szent-Györgyi proposed to rename it "a-scorbic acid" for the compound, and later specifically -ascorbic acid. Because of their work, in 1937 two Nobel Prizes: in Chemistry and in Physiology or Medicine were awarded to Haworth and Szent-Györgyi, respectively. Chemical properties. Acidity. Ascorbic acid is a furan-based lactone of 2-ketogluconic acid. It contains an adjacent enediol adjacent to the carbonyl. This −C(OH)=C(OH)−C(=O)− structural pattern is characteristic of reductones, and increases the acidity of one of the enol hydroxyl groups. The deprotonated conjugate base is the ascorbate anion, which is stabilized by electron delocalization that results from resonance between two forms:
For this reason, ascorbic acid is much more acidic than would be expected if the compound contained only isolated hydroxyl groups. Salts. The ascorbate anion forms salts, such as sodium ascorbate, calcium ascorbate, and potassium ascorbate. Esters. Ascorbic acid can also react with organic acids as an alcohol forming esters such as ascorbyl palmitate and ascorbyl stearate. Nucleophilic attack. Nucleophilic attack of ascorbic acid on a proton results in a 1,3-diketone: Oxidation. The ascorbate ion is the predominant species at typical biological pH values. It is a mild reducing agent and antioxidant, typically reacting with oxidants of the reactive oxygen species, such as the hydroxyl radical. Reactive oxygen species are damaging to animals and plants at the molecular level due to their possible interaction with nucleic acids, proteins, and lipids. Sometimes these radicals initiate chain reactions. Ascorbate can terminate these chain radical reactions by electron transfer. The oxidized forms of ascorbate are relatively unreactive and do not cause cellular damage.
Ascorbic acid and its sodium, potassium, and calcium salts are commonly used as antioxidant food additives. These compounds are water-soluble and, thus, cannot protect fats from oxidation: For this purpose, the fat-soluble esters of ascorbic acid with long-chain fatty acids (ascorbyl palmitate or ascorbyl stearate) can be used as antioxidant food additives. Sodium-dependent active transport process enables absorption of Ascorbic acid from the intestine. Ascorbate readily donates a hydrogen atom to free radicals, forming the radical anion semidehydroascorbate (also known as monodehydroascorbate), a resonance-stabilized semitrione: Loss of an electron from semidehydroascorbate to produce the 1,2,3-tricarbonyl pseudodehydroascorbate is thermodynamically disfavored, which helps prevent propagation of free radical chain reactions such as autoxidation: However, being a good electron donor, excess ascorbate in the presence of free metal ions can not only promote but also initiate free radical reactions, thus making it a potentially dangerous pro-oxidative compound in certain metabolic contexts.
Semidehydroascorbate oxidation instead occurs in conjunction with hydration, yielding the bicyclic hemiketal dehydroascorbate. In particular, semidehydroascorbate undergoes disproportionation to ascorbate and dehydroascorbate: Aqueous solutions of dehydroascorbate are unstable, undergoing hydrolysis with a half-life of 5–15 minutes at . Decomposition products include diketogulonic acid, xylonic acid, threonic acid and oxalic acid. Other reactions. It creates volatile compounds when mixed with glucose and amino acids at 90 °C. It is a cofactor in tyrosine oxidation, though because a crude extract of animal liver is used, it is unclear which reaction catalyzed by which enzyme is being helped here. For known roles in enzymatic reactions, see . Because it reduces iron(III) and chelates iron ions, it enhances the oral absorption of non-heme iron. This property also applies to its enantiomer. Conversion to oxalate. In 1958, it was discovered that ascorbic acid can be converted to oxalate, a key component of calcium oxalate kidney stones. The process begins with the formation of dehydroascorbic acid (DHA) from the ascorbyl radical. While DHA can be recycled back to ascorbic acid, a portion irreversibly degrades to 2,3-diketogulonic acid (DKG), which then breaks down to both oxalate and the sugars L-erythrulose and threosone. Research conducted in the 1960s suggested ascorbic acid could substantially contribute to urinary oxalate content (possibly over 40%), but these estimates have been questioned due to methodological limitations. Subsequent large cohort studies have yielded conflicting results regarding the link between vitamin C intake and kidney stone formation. The overall clinical significance of ascorbic acid consumption to kidney stone risk, however, remains inconclusive, although several studies have suggested a potential association, especially with high-dose supplementation in men.
Uses. Food additive. The main use of -ascorbic acid and its salts is as food additives, mostly to combat oxidation and prevent discoloration of the product during storage. It is approved for this purpose in the EU with E number E300, the US, Australia, and New Zealand. The "" enantiomer (erythorbic acid) shares all of the non-biological chemical properties with the more common enantiomer. As a result, it is an equally effective food antioxidant, and is also approved in processed foods. Dietary supplement. Another major use of -ascorbic acid is as a dietary supplement. It is on the World Health Organization's List of Essential Medicines. Its deficiency over a prolonged period of time could cause scurvy, which is characterized by fatigue, widespread weakness in connective tissues and capillary fragility. It affects multiple organ systems due to its role in the biochemical reactions of connective tissue synthesis. Synthesis. Natural biosynthesis of vitamin C occurs through various processes in many plants and animals.
Industrial preparation. Seventy percent of the world's supply of ascorbic acid is produced in China. Ascorbic acid is prepared in industry from glucose in a method based on the historical Reichstein process. In the first of a five-step process, glucose is catalytically hydrogenated to sorbitol, which is then oxidized by the microorganism "Acetobacter suboxydans" to sorbose. Only one of the six hydroxy groups is oxidized by this enzymatic reaction. From this point, two routes are available. Treatment of the product with acetone in the presence of an acid catalyst converts four of the remaining hydroxyl groups to acetals. The unprotected hydroxyl group is oxidized to the carboxylic acid by reaction with the catalytic oxidant TEMPO (regenerated by sodium hypochlorite bleaching solution). Historically, industrial preparation via the Reichstein process used potassium permanganate as the bleaching solution. Acid-catalyzed hydrolysis of this product performs the dual function of removing the two acetal groups and ring-closing lactonization. This step yields ascorbic acid. Each of the five steps has a yield larger than 90%.
A biotechnological process, first developed in China in the 1960s but further developed in the 1990s, bypassing acetone-protecting groups. A second genetically modified microbe species, such as mutant "Erwinia", among others, oxidises sorbose into 2-ketogluconic acid (2-KGA), which can then undergo ring-closing lactonization via dehydration. This method is used in the predominant process used by the ascorbic acid industry in China, which supplies 70% of the world's ascorbic acid. Researchers are exploring means for one-step fermentation. Determination. The traditional way to analyze the ascorbic acid content is by titration with an oxidizing agent, and several procedures have been developed. The popular iodometry approach uses iodine in the presence of a starch indicator. Iodine is reduced by ascorbic acid, and when all the ascorbic acid has reacted, the iodine is in excess, forming a blue-black complex with the starch indicator. This indicates the end-point of the titration. As an alternative, ascorbic acid can be treated with iodine in excess, followed by back titration with sodium thiosulfate using starch as an indicator.
This iodometric method has been revised to exploit the reaction of ascorbic acid with iodate and iodide in acid solution. Electrolyzing the potassium iodide solution produces iodine, which reacts with ascorbic acid. The end of the process is determined by potentiometric titration like Karl Fischer titration. The amount of ascorbic acid can be calculated by Faraday's law. Another alternative uses "N"-bromosuccinimide (NBS) as the oxidizing agent in the presence of potassium iodide and starch. The NBS first oxidizes the ascorbic acid; when the latter is exhausted, the NBS liberates the iodine from the potassium iodide, which then forms the blue-black complex with starch.
AFC Ajax Amsterdamsche Football Club Ajax (), also known as AFC Ajax, Ajax Amsterdam, or commonly Ajax, is a Dutch professional football club based in Amsterdam, that plays in the , the top tier in Dutch football. Historically, Ajax (named after the legendary Greek hero) is the most successful club in the Netherlands, with 36 and 20 KNVB Cups. It has continuously played in the since the league's inception in 1956, and along with and , it is one of the country's "big three" clubs. Ajax was one of the most successful clubs in the world in the 20th century. According to the International Federation of Football History & Statistics, Ajax was the seventh-most successful European club of the 20th century and "The World's Club Team of the Year" in 1992. According to German magazine "Kicker", Ajax was the second-most successful European club of the 20th century. The club is one of five teams that have earned the right to keep the European Cup and to wear a multiple-winner badge. In 1972, they completed the continental treble by winning the , KNVB Cup, and the European Cup. They also won the first (albeit unofficial) European Super Cup against Rangers in January 1973. Ajax's most recent international trophies are the 1995 Intercontinental Cup, 1995 UEFA Super Cup and the 1995 Champions League, where they defeated Milan in the final; they lost the 1996 Champions League final on penalties to Juventus. In 1995, Ajax was crowned as "World Team of the Year" by "World Soccer" magazine.
Ajax is also one of four teams to win the continental treble and the Intercontinental Cup or Club World Cup in the same season/calendar year; this was achieved in the 1971–72 season. Ajax is one of five clubs to have won all three major UEFA club competitions. They have also won the Intercontinental Cup twice, the 1991–92 UEFA Cup, as well as the Karl Rappan Cup, a predecessor of the UEFA Intertoto Cup in 1962. Ajax plays at the Johan Cruyff Arena, which opened as the Amsterdam ArenA in 1996 and was renamed in 2018. They previously played at and the Amsterdam Olympic Stadium (for international matches). Throughout their history, Ajax have cultivated a reputation for scouting, spotting and developing young talent, and have remained focused on developing a youth system. History. Ajax was founded in Amsterdam on 18 March 1900. The club achieved promotion to the highest level of Dutch football in 1911 and had its first major success in 1917, winning the KNVB Beker, the Netherlands' national cup. The following season, Ajax became national champion for the first time. The club defended its title in 1918–19, becoming the only team to achieve an unbeaten season in the Netherlands Football League Championship.
Throughout the 1920s, Ajax was a strong regional power, winning the Eerste Klasse West division in 1921, 1927 and 1928, but could not maintain its success at the national level. This changed in the 1930s, with the club winning five national championships (1931, 1932, 1934, 1937, 1939), making it the most successful Dutch team of the decade. Ajax won its second KNVB Cup in 1942–43, and an eighth Dutch title in 1946–47, the last season the club was managed by Englishman Jack Reynolds, who, up to this point, had overseen all of its national championship successes as well as its 1917 KNVB Cup win. In 1956, the first season of the Netherlands' new professional league, the , was played with Ajax participating as a founding member. The Amsterdam club became the first national champions under the new format and made its debut in the European Champion Clubs' Cup the following year, losing to Hungarian champions 6–2 on aggregate at the quarter-final stage. The team was again champions in 1960 and won a third KNVB Cup in 1961.
In 1965, Rinus Michels, who had played for the club between 1946 and 1958, was appointed manager of Ajax, implementing his philosophy of Total Football which was to become synonymous with both Ajax and the Netherlands national team. A year earlier, Johan Cruyff, who would go on to become widely regarded as the greatest Dutch footballer of all time, made his debut. Between them, Michels and Cruyff led Ajax through the most successful period in its history, winning seven titles, four KNVB Cups and three European Cups. Ajax won the Dutch championship in 1966, 1967 and 1968, and reached the 1969 European Cup final, losing to Milan. During the 1966–67 season, Ajax scored a record 122 goals in an season and also won the KNVB Cup to achieve its first league and cup double. In 1969–70, Ajax won a fourth Dutch league championship and second league and cup double in five seasons, winning 27 out of 34 league matches and scoring 100 goals. The 1970–71 season saw Ajax retain the KNVB Cup and reach the 1971 European Cup final, where they defeated 2–0 with goals from Dick van Dijk and Arie Haan to become continental champions for the first time, with Cruyff being named European Footballer of the Year. After this success, Michels departed to become manager of Barcelona and was replaced by the Romanian Ștefan Kovács. In Kovács' first season, Ajax completed a treble of the European Cup, the and a third consecutive KNVB Cup. The following season, the team beat Argentine to win the 1972 Intercontinental Cup and retained their and European Cup titles, becoming the first club to win three consecutive European Cups since Real Madrid in the 1950s.
In 1973, Michels' Barcelona broke the world transfer record to bring Cruyff to Catalonia. Kovács also departed to become manager of the France national team, signalling the end of this period of international success. In 1976–77, Ajax won its first domestic championship in four seasons and recorded a double of the and KNVB Cup two years later. The early 1980s saw the return of Cruyff to the club, as well as the emergence of young players Marco van Basten and Frank Rijkaard. The team won back-to-back titles in 1982 and 1983, with all three playing a significant role in the latter. After Cruyff's sale to rivals in 1983, van Basten became Ajax's key player, top scoring in the for four seasons between 1983–84 and 1986–87. In 1985, Cruyff returned to Ajax as manager and the team ended his first season in charge with 120 goals from 34 matches. However, Ajax still finished as runner-up to PSV by eight points. The following season, Ajax again lost out on the title to PSV, but won the European Cup Winners' Cup, its first continental trophy in 14 years. After this, Cruyff left the club to become manager of Barcelona and Rijkaard and van Basten were sold to Sporting CP and Milan respectively. Despite these losses, Ajax reached a second consecutive Cup Winners' Cup final in 1988, where they lost to Belgian club .
The 1988–89 season saw Dennis Bergkamp, a young forward who had first appeared under Cruyff in 1986, establish himself as a regular goalscorer for Ajax. Bergkamp helped Ajax to the title and was the top scorer in the division in 1990–91, 1991–92 and 1992–93. Under the management of Louis van Gaal, Ajax won the UEFA Cup in 1992 to become the second club, after , to have won all three major European club competitions. After the sale of Bergkamp to in 1993, van Gaal re-signed the experienced Rijkaard to complement his young Ajax team featuring academy graduates Frank and Ronald de Boer, Edwin van der Sar, Clarence Seedorf, Edgar Davids, Michael Reiziger and Winston Bogarde, as well as mercurial foreign talents Finidi George, Nwankwo Kanu and Jari Litmanen, and veteran captain Danny Blind. The team regained the Dutch championship in 1993–94, and won it again in 1994–95 and 1995–96 to become the first Ajax side to win three back-to-back championships since 1968. The height of van Gaal's success came in 1994–95, where Ajax became the first, and to date only, team to complete an entire season unbeaten. The team also won its first European Cup since its 1970s era, defeating Milan in the 1995 UEFA Champions League final 1–0, with the winning goal scored by 18-year-old Patrick Kluivert. Ajax again reached the final one year later, and was defeated on penalties by .
Ajax's return as a European force was short-lived, as van Gaal and several members of the squad soon departed to some of the continent's biggest clubs. The 2000s was a lean decade for the club, with only two championships won. However, Ajax's academy continued to produce star players such as Wesley Sneijder and Rafael van der Vaart. In 2010, Frank de Boer was appointed manager of Ajax and led the club to its first league title in seven years, and record 30th title overall, in the 2010–11 season. This was followed by back-to-back wins in 2011–12 and 2012–13 to match his three consecutive titles as a player in the 1990s. In 2013–14, Ajax was again champions, winning four consecutive league titles for the first time in club history. After finishing as runner-up to PSV in both 2014–15 and 2015–16, de Boer resigned as Ajax head coach in May 2016. Peter Bosz took over the club and led them to the 2017 UEFA Europa League final, their first European final in 21 years. They lost to Manchester United with a lineup that was the youngest ever in a European final, averaging an age of 22 years and 282 days. For the third consecutive season, they finished runner-up in the , this time to .
The 2018–19 season for Ajax involved a remarkable run in the UEFA Champions League. Due to their runner-up finish in the 2017–18 Eredivisie, Ajax entered the tournament in the second qualifying round. After successive victories against Sturm Graz, and , they qualified for the group stage. Ajax was drawn in a group with German champions Bayern Munich, Portuguese side Benfica and Greek champions AEK Athens. Ajax finished runner-up in this group, qualifying for the knockout stages, where it was drawn against three-time defending champions Real Madrid. After losing 1–2 in the first leg, they defeated Real Madrid 4–1 in the away match, stunning the defending champions in their own stadium, the Santiago Bernabéu, with an aggregate score of 5–3. Dušan Tadić was awarded a perfect score of 10 by following the match. Thus, Ajax progressed to the quarter-finals and was drawn with Italian champions . In the first leg in the Johan Cruyff Arena, they drew 1–1. In the second leg at the Juventus Stadium, Ajax came from behind to win 2–1 and 3–2 on aggregate. Matthijs de Ligt scored the winning goal for Ajax to help the team advance to its first Champions League semi-final since 1997. There, they would face English side Tottenham Hotspur.
In the first leg of the semi-final, Ajax beat Tottenham 1–0 away from home. In the second leg, Ajax scored twice in the first half to generate a 3–0 lead on aggregate. However, in the second half, Lucas Moura scored three times, including in the 6th minute of added time, resulting in Ajax losing via the away goals rule. Ajax was in first place on goal difference when the was declared void, preventing them being Dutch champions for the 35th time, but still qualified for the 2020–21 UEFA Champions League. In this, it was eliminated again, but in 2021 it reached the quarter-finals of the Europa League. It was eliminated against AS Roma. That season, it again won both the national title and the KNVB Cup. In the 2021–22 AFC Ajax season Ajax again became champion of the Netherlands. It had to give up the KNVB Cup and the Johan Cruijff Shield to competitor PSV because it came out on the losing end in both finals. In European terms, Ajax achieved first place in the Champions League group, all six matches were won, mostly by a wide margin. After the winter break, Ajax was narrowly eliminated in the eighth finals by the Portuguese Benfica Lisboa (Lisbon) (2–2 away, 0–1 at home).
As of July 1, 2022, Alfred Schreuder succeeded Erik ten Hag, who left for Manchester United, as Ajax's coach. Most of the key players from previous seasons left during the summer transfer period, but there was also a lot of reinvestment. Ajax started the 2022/23 season relatively well with six consecutive victories in the Eredivisie. But Ajax was eliminated from the Champions League quite quickly in a group with Liverpool FC, SSC Napoli and Rangers FC. At home against Napoli on October 4, 2022, they even lost by 5 goals (1–6), Ajax's biggest defeat ever in European competition. After seven consecutive matches without a win head coach Alfred Schreuder was dismissed. John Heitinga succeeded Schreuder as interim. Under Heitinga, Ajax failed to turn things around despite a good start with seven wins in a row. Ajax finished third in the Eredivisie, behind champions Feyenoord and runners-up PSV. This was the club's lowest final ranking since the 2008/09 season, in which it also finished third. After the winter break, Ajax was eliminated in the first knockout phase of the Europa League by Union Berlin (3–1). Ajax did reach the final of the KNVB Cup, but lost to PSV on penalties (3–2).
On May 19, 2023, Sven Mislintat took over as Ajax's sports director. He succeeded Marc Overmars, who left in early 2022. Mislintat appointed Maurice Steijn as head coach. Mislintat spent approximately 111 million euros on transfers. Ajax had its worst start to the season in fifty-nine years. On October 29, 2023, Ajax reached a historic low. Ajax lost 5–2 to PSV in Eindhoven. This put Ajax in last place, 18th place in the Eredivisie, for the first time since the club was founded. The position of director Mislintat became an embarrassment after it emerged that he had arranged a transfer through a player agent who was an investor in his company. In the evening of 24 September Mislintat was fired with immediate effect, among other things a lack of broad support within the club was one of the reasons. A day after the loss against PSV it was announced that John van 't Schip would become the head coach until the end of the season. Under the leadership of Van 't Schip Ajax managed to climb to 5th place in the Eredivisie. In the Europa League Ajax finished third, which meant a sequel in the Conference League, were it eventually lost to Aston Villa in the round of 16. In the cup Ajax was eliminated 3–2 by the third division amateurs of USV Hercules.
In the summer of 2024 a rebuild began, with a new board of directors and Alex Kroes and Marijn Beuker as Technical Director and Director of Football. They hired Francesco Farioli as new head coach, the first foreign coach since 1998. Under his leadership Ajax reached the league phase of the Europa League where it finished 11th. On the 9th of February 2025 Ajax finished the weekend on the first place for the first time since November 2022. Academies. The club is also particularly famous for its renowned youth programme that has produced many Dutch talents over the years – Johan Cruyff, Edwin van der Sar, Gerald Vanenburg, Frank Rijkaard, Dennis Bergkamp, Rafael van der Vaart, Patrick Kluivert, Marco van Basten, Wesley Sneijder, Maarten Stekelenburg, Nigel de Jong, Frenkie de Jong, and Matthijs de Ligt have come through the ranks and are just some of the talents who have played for Ajax. Ajax also regularly supplies the Dutch national youth teams with local talent. Due to mutual agreements with foreign clubs, the youth academy has also signed foreign players as teenagers before making first team debuts, such as Belgian defensive trio Jan Vertonghen, Toby Alderweireld and Thomas Vermaelen along with winger Tom De Mul, all of whom are full internationals, as well as Dutch international Vurnon Anita and Javier Martina, representing Curaçao.
Ajax has also expanded its talent searching programme to South Africa with Ajax Cape Town. Ajax Cape Town was set up with the help of Rob Moore. Ajax has also had a satellite club in the United States under the name Ajax America, until it filed for bankruptcy. There are some youth players from Ajax Cape Town that have been drafted into the squad, such as South African internationals Steven Pienaar and Thulani Serero and Cameroonian international Eyong Enoh. In 1995, the year Ajax won the UEFA Champions League, the Netherlands national team was almost entirely composed of Ajax players, with van der Sar in goal; players such as Michael Reiziger, Frank de Boer and Danny Blind in defence; Ronald de Boer, Edgar Davids and Clarence Seedorf in midfield; and Patrick Kluivert and Marc Overmars in attack. In 2011, Ajax opened its first youth academies outside the Netherlands when the club partnered up with George Kazianis and All Star Consultancy in Greece to open the Ajax Hellas Youth Academy. The offices are based in Nea Smyrni, Attica, with the main training facility located on the island of Corfu, hosting a total of 15 football youth academies throughout Greece and Cyprus. Eddie van Schaik heads the organization as coach and consultant, introducing the Ajax football philosophy at the various Greek football training camps.
In 2016, Ajax launched the ACA (Ajax Coaching Academy) with the intention of sharing knowledge, and setting up a variety of camps and clinics for both players and coaches. Stadiums. Ajax's first stadium was built in 1911 out of wood and was called Het Houten Stadion (English: The Wooden Stadium). Ajax later also played in the Olympic Stadium built for the 1928 Summer Olympics hosted in Amsterdam. This stadium, designed by Jan Wils, is known in Dutch as . In 1934, Ajax moved to De Meer Stadion in east Amsterdam, close to the location of Het Houten Stadion. It was designed by architect and Ajax-member Daan Roodenburgh, who had also designed the club's first stadium. It could accommodate 29,500 spectators and Ajax continued to play there until 1996. For big European and national fixtures, the club would often play at the Olympic Stadium, which could accommodate about twice the number of spectators. In 1996, Ajax moved to a new home ground in the southeast of the city known as the Amsterdam Arena, since 2018 known as the Johan Cruyff Arena. This stadium was built by the Amsterdam city authority at a cost of $134 million. The stadium is capable of holding 55,865 spectators. The Arena has a retractable roof and set a trend for other modern stadiums built in Europe in the following years. In the Netherlands, the Arena earned a reputation for a terrible grass pitch caused by the removable roof that, even when open, takes away too much sunlight and fresh air. During the 2008–09 season, ground staff introduced an artificial lighting system that finally reduced this problem considerably.
The much-loved De Meer Stadion was torn down and the land was sold to the city council. A residential neighbourhood now occupies the area. The only thing left of the old stadium are the letters "AJAX", which nowadays is in place on the façade of the entrance at the Johan Cruyff Arena and a replica of the letters are at De Toekomst, near the Johan Cruyff Arena. Crest and colours. Crest. In 1900, when the club was founded, the emblem of Ajax was just a picture of an Ajax player. The crest was slightly altered following the club's promotion to the top division in 1911 to match the club's new outfits. In 1928, the club logo was introduced with the head of the Greek hero Ajax. The logo was once again changed in 1990 into an abstract version of the previous one. The new logo still sports the portrait of Ajax, but drawn with just 11 lines, symbolizing the 11 players of a football team. On 17 November 2024, Ajax announced on its official website that the classic logo of 1928 will return for the 2025–26 season, making a comeback after 34 years.
Colours. Ajax originally played in an all-black strip with a red sash tied around the players' waists, but that strip was soon replaced by a red/white striped shirt and black shorts. Red, black and white are the three colours of the flag of Amsterdam. Under manager Jack Kirwan, however, the club earned promotion to the top flight of Dutch football for the first time in 1911 (then the "Eerste Klasse" or 'First Class', later named the ), Ajax was forced to change its colours because Sparta Rotterdam already had exactly the same outfit. Special kits for away fixtures did not exist at the time and according to football association regulations the newcomers had to change their colours if two teams in the same league had identical uniforms. Ajax opted for white shorts and white shirt with a broad, vertical red stripe over chest and back, which still is Ajax's outfit. Financial. AFC Ajax N.V.. AFC Ajax is the only Dutch club with an initial public offering (IPO). The club is registered as a Naamloze vennootschap (N.V.) listed on the stock exchange Euronext Amsterdam, since 17 May 1998. With a launch price of ƒ25,- (Guilders) the club managed to a bring its total revenue up to €54 million (converted) in its first year on the market. After short-lived success, however, the rate dropped, at one point as low as €3.50. Criticism was brought forth that the legal grid for a naamloze vennootschap would not be suitable for a Football club, and that the sports related ambitions would suffer from the new commercial interests of the now listed Ajax. Shares of the company in the year 2008 were valued at approximately €5.90 per share.
In 2008, a Commission under guidance of honorary member Uri Coronel concluded that the IPO was of no value to the club, and that measures should be taken to exit the stock exchange by purchasing back all public shares. Ajax remain on the stock exchange. Sponsorship. Ajax's shirts have been sponsored by TDK from 1982 to 1991, and by ABN AMRO from 1991 to 2008. AEGON then replaced ABN AMRO as the new head sponsor for a period of seven years. On 1 April 2007, Ajax wore a different sponsor for the match against Heracles Almelo, "Florius". Florius is a banking programme launched by ABN AMRO who wanted it to be the shirt sponsor for one match. The shirts have been manufactured by Le Coq Sportif (1973–1977), Puma (1977–1979), Cor du Buy (1979–1980), Le Coq Sportif (1980–1984), Kappa (1985–1989) and Umbro (1989–2000) in the past, and by Adidas since 2000 (until at least 2025). At the conclusion of the 2013–14 season, Ajax won the Football shirt of the Year award for its black and rose colored away shirt by Adidas. The annual award was presented by Subside Sports, which had previously given the award to Internazionale, Juventus and the Belgium national team. It was Ajax's first time winning the award.
On 7 November 2014, it was announced that Ajax had agreed to a four-and-a-half-year contract worth €8 million annually with Dutch cable operating company Ziggo as the new shirt sponsor for the club. Having extended its contract with AEGON for half a season until December, the club featured "Fonds Gehandicaptensport", a charitable fund for handicapped sports on its away shirts for a six-month period before transitioning to Ziggo in 2015. Other teams. Reserves team. Jong Ajax ("formerly more commonly known as Ajax 2") is the reserve team of AFC Ajax. The team is composed mostly of professional footballers, who are often recent graduates from the highest youth level (Ajax A1) serving their first professional contract as a reserve, or players who are otherwise unable to play in the first team. Since 1992, Jong Ajax competed in the Beloften Eredivisie, competing against other reserve teams such as Jong PSV, Jong FC Groningen or Jong AZ. They have won the Beloften title a record eight times, as well as the KNVB Reserve Cup three times, making them the most successful reserve squad in the Netherlands. By winning the Beloften Eredivisie title, Jong Ajax was able to qualify for the actual KNVB Cup, even advancing to the semi-finals on three occasions. Its best result in the Dutch Cup was under manager Jan Olde Riekerink in 2001–02, when a semi-final loss to Utrecht in a Penalty shoot-out after extra time, which saw Utrecht advance, and thus preventing an Ajax–Jong Ajax Dutch Cup final.
The 2013–14 season marked the Jupiler League debut of the Ajax reserves' squad, Jong Ajax. Previously playing in the Beloften Eredivisie (a separate league for reserve teams, not included in the Dutch professional or amateur league structure), players were allowed to move around freely between the reserve team and the first team during the season. This is no longer the case as Jong Ajax now registers and fields a separate squad from that of Ajax first team for the Eerste Divisie, the second tier of professional football in the Netherlands. Its home matches are played at Sportpark De Toekomst, except for the occasional match in the Johan Cruyff Arena. Now regarded a semi-professional team in its own respect, the only period in which players are able to move between squads are during the transfer windows, unless the player has made less than 15 appearances for the first team, then he is still eligible to appear in both first team and second team matches during the season. Furthermore, the team is not eligible for promotion to the or to participate in the KNVB Cup. Jong Ajax was joined in the Eerste Divisie by Jong Twente and Jong PSV, reserve teams who have also moved from the Beloften to the Eerste Divisie, in place of VV Katwijk, SC Veendam and AGOVV Apeldoorn, increasing the total number of teams in the Jupiler League from 18 to 20.
Ajax reserve squad Jong Ajax left the Beloften Eredivisie in 2013, having held a 21-year tenure in the reserves league, having also won the league title a record eight times (1994, 1996, 1998, 2001, 2002, 2004, 2005, 2009). Women's team. AFC Ajax Vrouwen ("English: AFC Ajax Women") is the women's team of AFC Ajax, competing in the women's eredivisie, the highest level of women's football in the Netherlands. Founded on 18 May 2012, the women's team saw Ajax attracting many of the Netherlands top talents, with International players such as Anouk Hoogendijk, Daphne Koster and Petra Hogewoning joining the Amsterdam club in its maiden season in women's professional football. The team won its first piece of silverware when they defeated PSV/FC Eindhoven 2–1 in the final of the KNVB Women's Cup. Amateur team. AFC Ajax Amateurs, better known as Ajax Zaterdag, is a Dutch amateur football club founded 18 March 1900. It is the amateur team of the professional club AFC Ajax, playing its home matches at the Sportpark De Toekomst training grounds to a capacity of 5,000. The team was promoted from the Eerste Klasse to the Hoofdklasse ahead of the 2011–12 season, the league in which it is currently competing. The team has won the Eerste Klasse title twice, as well as the *KNVB District Cup West I on two occasions as well.
Furthermore, Ajax Zaterdag has also managed to qualify for the KNVB Cup on its own accord on three occasions, namely in 2004, 2005, 2008 and 2021. Even advancing to the second round before bowing out to Vitesse on 24 September 2008. Other sports. Baseball. Ajax HVA (1922–1972) was the baseball team of AFC Ajax founded in 1922, and competed as founding members of the Honkbal Hoofdklasse, the top flight of professional baseball in the Netherlands. Ajax won the national baseball title a total of four times (1924, 1928, 1942, 1948) before the club opted to no longer field a baseball team, and to focus solely on football in 1972. Ajax spent a total of 50 years at the top flight of Baseball in the Netherlands from 1922 to 1972. The dissolution of Ajax baseball club resulted in the players finding a new sponsor in a mustard manufacturing company called Luycks, while merging with the Diemen Giants to become the Luycks Giants, thus replacing both former clubs. Esports. In 2016, Ajax launched an esports team, with Koen Weijland as the club's first signing, making its debut on the Global stage of professional gaming. They have since signed the likes of Dani Hagebeuk, Lev Vinken, Joey Calabro and Bob van Uden, the latter spent his first season on loan to the esports team of Japanese club Sagan Tosu.
Affiliated clubs. The following clubs are currently affiliated with AFC Ajax: The following clubs were affiliated with AFC Ajax in the past: Rivalries. "As one of the traditional big three clubs in the Netherlands, Ajax have amassed a number of intense rivalries over the years. Listed below are the most significant of the rivalries involving Ajax." Rivalry with Feyenoord. Feyenoord from Rotterdam is Ajax's archrival. Every year both clubs play the "De Klassieker" ("The Classic"), a match between the teams from the two largest cities of the Netherlands. Till the 1973/74-season, Ajax and Feyenoord were the only two clubs in the Netherlands who were able to clinch national titles, as well as achieve continental and even global success. From the 1974/75-season on, PSV (Eindhoven) and AZ (Alkmaar) too, competed with Ajax and Feyenoord. A meeting between the two clubs became the measure for who was truly the best club in the Netherlands. The "Klassieker" is the most famous of all the rivalries in the Netherlands and the matches are always sold out. The fixture is seen in the public eye as "the graceful and elegant football of Ajax, against the indomitable fighting spirit of Feyenoord"; the confidence of the capital city versus the blue collar mentality of Rotterdam. Matches are known for their tension and violence, both on and off the pitch. Over the years, several violent incidents have taken place involving rival supporters, leading to the current prohibition of away supporters in both stadiums. The lowest point was reached on 23 March 1997, when supporters of both clubs met on a field near Beverwijk, where Ajax-supporter Carlo Picornie was fatally injured, the incident is commonly referred to as the "Battle of Beverwijk".
Rivalry with PSV. PSV is also a rival of Ajax, but in terms of tension and rivalry, these matches are not as loaded as the duels with Feyenoord. The rivalry has existed for some time with PSV and stems from various causes, such as the different interpretations of whether current national and international successes of both clubs correlates and the supposed opposition between the Randstad and the province. The matches between these two teams is commonly referred to as "De Topper" ("The Topper"), and involves the two most trophy-laden sides in Dutch football and is essentially a clash of two competing schools of thought in Dutch football. Historically, PSV compete with a workmanlike ethic, preferring a more robust 4–3–1–2 or 4–2–3–1, typically shunning the frivolous 4–3–3 approach favoured in Amsterdam. While Rinus Michels and Johan Cruyff helped to innovate Total Football in the sixties and seventies, a different philosophy was honed in Eindhoven by Kees Rijvers and Guus Hiddink in the late 1970s and '80s. This in turn has created one of the more philosophical rivalries in football, an ideological battleground, which is gradually becoming as heated and intense as the matches Ajax and Feyenoord partake in.
Rivalries with other clubs. Aside from Feyenoord and PSV, Ajax have several other rivalries, although in most cases the sentiment is mostly felt by the opposition and is more directed towards Ajax, with one of them being Utrecht. Although the rivalry is more felt on the Utrecht side then with Ajax, matchups between the two sides are often quite intense. Both teams have fanatic supporters, and clashes off the pitch are more often the rule than the exception. The same goes for ADO Den Haag, with both supporter groups often getting in conflicts, when ADO-Hooligans set fire to the supporters home of Ajax, and Ajax hooligans subsequently broke into the Supporters home of ADO tensions between the two clubs rose. In 2006, supporters from both clubs were banned from attending away matches for five years due to frequent violent outbreaks and clashes. Further teams who share a rivalry with Ajax include Twente, Vitesse Arnhem, Groningen and AZ, although the latter is often regarded by Ajax supporters as the club's "little brother". With AZ being from nearby Alkmaar and therefore situated in the same province as Ajax, match-ups between the two sides are commonly known as the "De Noord-Hollandse Derby" ("North Holland Derby") and are often very competitive, intense and loaded fixtures.
Past rivalries include local Amsterdam derbies between Ajax and clubs such as Blauw-Wit, DWS and De Volewijckers (which later merged to become FC Amsterdam in 1972). However, the tension between the local sides lessened as the division of the clubs through playing in different leagues over time became greater. Years of not competing in the same league resulted in less frequent match-ups, until tensions finally settled between the Amsterdam clubs. The last Amsterdam derby to take place in an official league match was when Ajax defeated FC Amsterdam 5–1 on 19 March 1978. Supporters. Ajax is known for having fanatic core supporter-groups, of which F-Side and VAK410 are the most famous. The F-Side was founded on 3 October 1976, and is situated right behind the goal in the Johan Cruyff Arena, on the southern end of the stadium in rows 125–129. Its name is derived from the group's former location on the F-side of the old De Meer Stadion. The F-side supporters are responsible for a big part of the atmosphere in the stadium, and are also known for rioting during and after matches. If in any match Ajax should win the coin toss, the second half of the match Ajax always play towards the south-end of the stadium. VAK410 (English: Row 410) was founded in 2001 and is situated in the Zuidhoek ("South corner") of the stadium on the upper ring in rows 424–425. The group was originally situated on the North-West side of the stadium in row 410, from where it derives its name, until relocating to their current place in the stands in 2008. Members of VAK410 are known to perform various stunts, which include massive banners, to enhance the atmosphere in the stadium. Neither F-Side or VAK410 have seats in their sections of the stadium, and both groups stand for the duration of the match.
Through the official "Football Top 20" of Dutch sports research group "SPORT+MARKT", it was revealed in 2010 that Ajax had approximately 7.1 million supporters throughout Europe. This is significantly more than rivals Feyenoord and PSV (each 1.6 and 1.3 million, respectively), which puts Ajax as the club with the 15th-most supporters across Europe. The study also revealed that approximately 39% of the Netherlands were Ajax supporters. Not only does Ajax have many supporters, but several fans attend their matches in European competition, with an average attendance of 48,677 spectators for every international match Ajax played, putting the team at 12th place in Europe for highest attendance, ahead of high-profile clubs such as Milan and Chelsea. It is noteworthy that not all stadiums share the capacity of the Johan Cruyff Arena. Supporters clubs. The Supporters Club Ajax () is officially the largest supporters club in the Netherlands with 94,000 members. Founded on 7 May 1992, the supporters club organize big monthly events throughout the Netherlands, and particularly around the official Ajax Open Training Day, which attracts thousands of supporters each year. Furthermore, the supporters group is responsible for the Ajax Life website, as well as the fanzine which is issued 20 times a year.
In 2006, the AFCA Supportersclub was introduced as the club's second official supporters' association, through the merger of the Onafhankelijke Fanclub Ajax (OFA) and the Ajax Supporters Delegatie (ASD). The AFCA Supportersclub has a reported 42,000 members, as well as a former member on the Board of Administration of Ajax, in Ronald Pieloor. The third official supporters club is the Ajax Business Associates (ABA). Founded in 1991 the ABA is the Business club of Ajax. Members occupy the skyboxes in the Stadium and can make use of the clubs' amenities and luxury suites including the ABA club and lounge. The ABA is also responsible for hosting the annual Ajax Business Golf Trophy, an amateur golf tournament where several active and former Ajax players, as well as prominent people and members of the ABA, participate. Average attendance. This graph displays the average attendance for home matches of Ajax from 1988 to 2018, whereby the difference in capacity of the De Meer Stadion and the Johan Cruyff Arena (est. 1996) is clearly visible.
Jewish connection. Historically, Ajax was popularly seen as having "Jewish roots". While it had fewer Jewish players than WV-HEDW, Ajax has had a Jewish image since the 1930s when the home stadium was located next to a Jewish neighbourhood of Amsterdam-Oost and opponents saw many supporters walking through the Nieuwmarkt/Waterloopleinbuurt (de Jodenhoek—the "Jews' corner") to get to the stadium. The city of Amsterdam was historically referred to as a Mokum city, Mokum (מקום) being the Yiddish word for "place" or "safe haven", and as anti-Semitic chants and name calling developed and intensified at the old De Meer Stadion from frustrated supporters of opposing clubs, Ajax fans (few of whom are Jewish) responded by embracing Ajax's "Jewish" identity: calling themselves "super Jews", chanting "Jews, Jews" ("Joden, Joden") at games, and adopting Jewish symbols such as the Star of David and the Israeli flag, similar to what supporters of the English Premier League club Tottenham Hotspur did with the term "yid" This Jewish imagery eventually became a central part of Ajax fans' culture. At one point, ringtones of "Hava Nagila", a Hebrew folk song, could be downloaded from the club's official website. Beginning in the 1980s, fans of Ajax's rivals escalated their anti-Semitic rhetoric, chanting slogans like "Hamas, Hamas/Jews to the gas" ("Hamas, hamas, joden aan het gas"), hissing to imitate the flow of gas, giving Nazi salutes, and other things. The eventual result was that many genuinely Jewish Ajax fans stopped going to games.
In the 2000s, the club began trying to persuade fans to drop its Jewish image. In 2013, a documentary titled "Superjews" was released by NTR and Viewpoint Productions which premiered at the International Documentary Film Festival Amsterdam (IDFA). The film was directed by Nirit Peled, an Israeli living in Amsterdam, and an independent film maker who offers a very personal view into the game, the lore of Ajax and its relation to Judaism from both the supporters as well as from a Jewish perspective. Before and after a UEFA Europa League game between the Israeli team Maccabi Tel Aviv and Ajax on Thursday 7 November 2024 in the Johan Cruyff Arena, tensions surrounding the Gaza war erupted into violence. Players. Players out on loan. Retired numbers. "Notes": Youth/reserves squad. "For the reserve squad of Ajax see: Jong Ajax." Honours. Ajax also won in 1972, however UEFA only sanctioned the UEFA Super Cup for the first time in 1973 so the 1972 edition was an unofficial one. Played against Rangers, winners of the 1971–72 European Cup Winners' Cup, it went ahead as 'a celebration of the Centenary of Rangers F.C.' (see below) because Rangers was serving a one-year ban at the time, imposed by UEFA for the misbehaviour of its fans. That victory meant Ajax had won every tournament (5 in total) they entered that year, a feat Celtic achieved in 1967 (with 6 trophies), Barcelona in 2009 (6 trophies), and Bayern in 2020 (also 6 trophies).
Other trophies. Ajax have won numerous friendly tournaments, unsanctioned by UEFA or FIFA, including the Amsterdam Tournament, Bruges Matins Trophy, Trofeo Santiago Bernabéu, Eusébio Cup, Ted Bates Trophy, Jalkapalloturnaus and Chippie Polar Cup ("for a complete list, see: list of AFC Ajax honours"). Honorary club members. Ajax have a total of 50 honorary club members, from people who have been invested within the club's administrative engagements, to committed players who have excelled in the athletic department. Of those 50 members 41 have since died. Nine members still remain, including Louis van Gaal. He was made honorary member in 2024. The remaining 41 honorary members who have since died: Results. Domestic results. Below is a table with Ajax's domestic results since the introduction of the in 1956. Club van 100. The Club van 100 is the official list of Football players who have appeared in one hundred or more official matches for AFC Ajax. The club currently has a total of over 150 members. The record for league appearances is held by Mr. Ajax himself Sjaak Swart, who appeared in 463 league matches for Ajax. There is a beneficiary team called Lucky Ajax, which was initiated by Sjaak Swart. Lucky Ajax participate in at least one match a year, usually in the name of charity, and commonly at football ceremonies to bid farewell to retiring players. One of the prerequisites for playing on Lucky Ajax, which is invitational only, is that you are a member of the Club van 100, having made at least 100 official match appearances for Ajax in the first team of the club.
Lucky Ajax. Lucky Ajax is a beneficiary team that was initiated by Sjaak Swart in the seventies, competing in at least one match a year, usually in the name of charity and/or to bid farewell to retiring former Ajax players. The team is made up of various members of the Club van 100 of Ajax who will come out of retirement for this match to face the Ajax squad that is current of that year. Past participants have included Barry Hulshoff, Sonny Silooy, Simon Tahamata, Ronald Koeman, Tscheu La Ling, Gerrie Mühren, John van 't Schip, Brian Roy, Stanley Menzo, Peter van Vossen and Fred Grim. The name Lucky Ajax is derived from the famous "Lucky Ajax" nickname from how people used to refer to the club when Ajax would either win a match by chance, by a decision of a referee, or by coincidence such as was said to be the case during the infamous "Mistwedstrijd" ("Fog Match"). Number 14 shirt. As of the 2007–08 season, no player could wear the number 14 shirt at Ajax after the club decided to retire the shirt out of respect for Johan Cruyff, "the legendary number fourteen". Cruyff himself laughed off the tribute, saying the club had to let its best player play with number 14. Spanish midfielder Roger was the last player to wear the number. Marvin Zeegelaar wore the shirt number in preparation for the 2011–12 season in one preseason match, while Aras Özbiliz wore the number 14 shirt in one pre-season match ahead of the 2011–12 season as well. The club stated that this was, in fact, not done in error.
Below is a list of all players to wear the number 14 shirt since Johan Cruyff's departure. Team tournaments. Amsterdam Tournament. Established in 1975 as the Amsterdam 700 Tournament to celebrate 700 years of history in the city. The tournament was hosted annually each summer by Ajax until 1992, when the last edition of the original tournament was played. It returned in 1999 with the backing of the International Event Partnership (IEP). Four teams participated in the competition, played in a league format since 1986. Since its return, the tournament used an unusual point scoring system. As with most league competitions, three points were awarded for a win, one for a draw, and none for a loss. An additional point, however, was awarded for each goal scored. The system was designed to reward teams that adopted a more attacking style of play. Each entrant played two matches, with the winner being the club that finished at the top of the table. The original competition was held at Het Olympisch Stadion where Ajax played the bigget games until 1996. The Amsterdam Arena (now Johan Cruyff Arena) played host to the event since its return until the last edition was played in 2009. Ajax is the most successful team of the tournament, having won it a record ten times, while Benfica from Portugal was the last team to win the tournament, in 2009.
Copa Amsterdam. Established in 2005, the Copa Amsterdam is an international friendly football tournament for Under-19 youth teams, that is organized by Ajax and the Amsterdam city council, which takes place at the Olympic Stadium as part of the annual Amsterdam Sports Weekend, a citywide sponsored initiative to promote 'sports and recreation' within the city of Amsterdam. Each Summer the city of Amsterdam and Ajax invite U-19 teams from various top clubs from around the World to participate in the tournament. Seven teams are invited and play in the competition every year. Over the years, clubs such as Barcelona, Juventus, Chelsea and Real Madrid have had their senior youth teams participate in the tournament. Cruzeiro from Brazil is the most successful club in the history of the tournament, having won it three times in total. Future Cup. Established in 2010, the AEGON Future Cup is an international friendly tournament for Under-17 youth teams, which is organized by AFC Ajax and their main sponsor, the insurance company AEGON. The tournament is held each year at the Johan Cruyff Arena and at the Sportpark De Toekomst, the team's training ground, which also inspired the name of the competition, since "De Toekomst" in Dutch means The Future. Every year during the Easter weekend, six U-17 teams are invited to participate in the competition, while the seventh place for the contesters is reserved for the winners of the "Craques Mongeral AEGON Future Cup" in Brazil, the sister competition of the tournament in South America. Youth teams from top clubs such as Manchester United, Bayern Munich, Milan and many more have participated in the competition over the years. Ajax is the most successful club of the tournament, having won the trophy a total of five times.
Arthur Eddington Sir Arthur Stanley Eddington, (28 December 1882 – 22 November 1944) was an English astronomer, physicist, and mathematician. He was also a philosopher of science and a populariser of science. The Eddington limit, the natural limit to the luminosity of stars, or the radiation generated by accretion onto a compact object, is named in his honour. Around 1920, he foreshadowed the discovery and mechanism of nuclear fusion processes in stars, in his paper "The Internal Constitution of the Stars". At that time, the source of stellar energy was a complete mystery; Eddington was the first to correctly speculate that the source was fusion of hydrogen into helium. Eddington wrote a number of articles that announced and explained Einstein's theory of general relativity to the English-speaking world. World War I had severed many lines of scientific communication, and new developments in German science were not well known in England. He also conducted an expedition to observe the solar eclipse of 29 May 1919 on the Island of Príncipe that provided one of the earliest confirmations of general relativity, and he became known for his popular expositions and interpretations of the theory.
Early years. Eddington was born 28 December 1882 in Kendal, Westmorland (now Cumbria), England, the son of Quaker parents, Arthur Henry Eddington, headmaster of the Quaker School, and Sarah Ann Shout. His father taught at a Quaker training college in Lancashire before moving to Kendal to become headmaster of Stramongate School. He died in the typhoid epidemic which swept England in 1884. His mother was left to bring up her two children with relatively little income. The family moved to Weston-super-Mare where at first Stanley (as his mother and sister always called Eddington) was educated at home before spending three years at a preparatory school. The family lived in a house called Varzin, at 42 Walliscote Road, Weston-super-Mare. A commemorative plaque on the building explains Eddington's contributions to science. In 1893 Eddington entered Brynmelyn School. He proved to be a most capable scholar, particularly in mathematics and English literature. His performance earned him a scholarship to Owens College, Manchester (what was later to become the University of Manchester), in 1898, which he was able to attend, having turned 16 that year. He spent the first year in a general course, but he turned to physics for the next three years. Eddington was greatly influenced by his physics and mathematics teachers, Arthur Schuster and Horace Lamb. At Manchester, Eddington lived at Dalton Hall, where he came under the lasting influence of the Quaker mathematician J. W. Graham. His progress was rapid, winning him several scholarships, and he graduated with a BSc in physics with First Class Honours in 1902.
Based on his performance at Owens College, he was awarded a scholarship to Trinity College, Cambridge, in 1902. His tutor at Cambridge was Robert Alfred Herman and in 1904 Eddington became the first ever second-year student to be placed as Senior Wrangler. After receiving his M.A. in 1905, he began research on thermionic emission in the Cavendish Laboratory. This did not go well, and meanwhile he spent time teaching mathematics to first year engineering students. This hiatus was brief. Through a recommendation by E. T. Whittaker, his senior colleague at Trinity College, he secured a position at the Royal Observatory, Greenwich, where he was to embark on his career in astronomy, a career whose seeds had been sown even as a young child when he would often "try to count the stars". Astronomy. In January 1906, Eddington was nominated to the post of chief assistant to the Astronomer Royal at the Royal Greenwich Observatory. He left Cambridge for Greenwich the following month. He was put to work on a detailed analysis of the parallax of 433 Eros on photographic plates that had started in 1900. He developed a new statistical method based on the apparent drift of two background stars, winning him the Smith's Prize in 1907. The prize won him a fellowship of Trinity College, Cambridge. In December 1912, George Darwin, son of Charles Darwin, died suddenly, and Eddington was promoted to his chair as the Plumian Professor of Astronomy and Experimental Philosophy in early 1913. Later that year, Robert Ball, holder of the theoretical Lowndean chair, also died, and Eddington was named the director of the entire Cambridge Observatory the next year. In May 1914, he was elected a fellow of the Royal Society: he was awarded the Royal Medal in 1928 and delivered the Bakerian Lecture in 1926.
Eddington also investigated the interior of stars through theory, and developed the first true understanding of stellar processes. He began this in 1916 with investigations of possible physical explanations for Cepheid variable stars. He began by extending Karl Schwarzschild's earlier work on radiation pressure in Emden polytropic models. These models treated a star as a sphere of gas held up against gravity by internal thermal pressure, and one of Eddington's chief additions was to show that radiation pressure was necessary to prevent collapse of the sphere. He developed his model despite knowingly lacking firm foundations for understanding opacity and energy generation in the stellar interior. However, his results allowed for calculation of temperature, density and pressure at all points inside a star (thermodynamic anisotropy), and Eddington argued that his theory was so useful for further astrophysical investigation that it should be retained despite not being based on completely accepted physics. James Jeans contributed the important suggestion that stellar matter would certainly be ionized, but that was the end of any collaboration between the pair, who became famous for their lively debates.
Eddington defended his method by pointing to the utility of his results, particularly his important mass–luminosity relation. This had the unexpected result of showing that virtually all stars, including giants and dwarfs, behaved as ideal gases. In the process of developing his stellar models, he sought to overturn current thinking about the sources of stellar energy. Jeans and others defended the Kelvin–Helmholtz mechanism, which was based on classical mechanics, while Eddington speculated broadly about the qualitative and quantitative consequences of possible proton–electron annihilation and nuclear fusion processes. Around 1920, he anticipated the discovery and mechanism of nuclear fusion processes in stars, in his paper "The Internal Constitution of the Stars". At that time, the source of stellar energy was a complete mystery; Eddington correctly speculated that the source was fusion of hydrogen into helium, liberating enormous energy according to Einstein's equation . This was a particularly remarkable development since at that time fusion and thermonuclear energy, and even the fact that stars are largely composed of hydrogen (see metallicity), had not yet been discovered. Eddington's paper, based on knowledge at the time, reasoned that:
All of these speculations were proven correct in the following decades. With these assumptions, he demonstrated that the interior temperature of stars must be millions of degrees. In 1924, he discovered the mass–luminosity relation for stars (see Lecchini in ""). Despite some disagreement, Eddington's models were eventually accepted as a powerful tool for further investigation, particularly in issues of stellar evolution. The confirmation of his estimated stellar diameters by Michelson in 1920 proved crucial in convincing astronomers unused to Eddington's intuitive, exploratory style. Eddington's theory appeared in mature form in 1926 as "The Internal Constitution of the Stars", which became an important text for training an entire generation of astrophysicists. Eddington's work in astrophysics in the late 1920s and the 1930s continued his work in stellar structure, and precipitated further clashes with Jeans and Edward Arthur Milne. An important topic was the extension of his models to take advantage of developments in quantum physics, including the use of degeneracy physics in describing dwarf stars.
Dispute with Chandrasekhar on the mass limit of stars. The topic of extension of his models precipitated his dispute with Subrahmanyan Chandrasekhar, who was then a student at Cambridge. Chandrasekhar's work presaged the discovery of black holes, which at the time seemed so absurdly non-physical that Eddington refused to believe that Chandrasekhar's purely mathematical derivation had consequences for the real world. Eddington was wrong and his motivation is controversial. Chandrasekhar's narrative of this incident, in which his work is harshly rejected, portrays Eddington as rather cruel and dogmatic. Chandra benefited from his friendship with Eddington. It was Eddington and Milne who put up Chandra's name for the fellowship for the Royal Society which Chandra obtained. An FRS meant he was at the Cambridge high-table with all the luminaries and a very comfortable endowment for research. Eddington's criticism seems to have been based partly on a suspicion that a purely mathematical derivation from relativity theory was not enough to explain the seemingly daunting physical paradoxes that were inherent to degenerate stars, but to have "raised irrelevant objections" in addition, as Thanu Padmanabhan puts it.
Relativity. During World War I, Eddington was secretary of the Royal Astronomical Society, which meant he was the first to receive a series of letters and papers from Willem de Sitter regarding Einstein's theory of general relativity. Eddington was fortunate in being not only one of the few astronomers with the mathematical skills to understand general relativity, but owing to his internationalist and pacifist views inspired by his Quaker religious beliefs, one of the few at the time who was still interested in pursuing a theory developed by a German physicist. He quickly became the chief supporter and expositor of relativity in Britain. He and Astronomer Royal Frank Watson Dyson organized two expeditions to observe a solar eclipse in 1919 to make the first empirical test of Einstein's theory: the measurement of the deflection of light by the Sun's gravitational field. In fact, Dyson's argument for the indispensability of Eddington's expertise in this test was what prevented Eddington from eventually having to enter military service.
When conscription was introduced in Britain on 2 March 1916, Eddington intended to apply for an exemption as a conscientious objector. Cambridge University authorities instead requested and were granted an exemption on the ground of Eddington's work being of national interest. In 1918, this was appealed against by the Ministry of National Service. Before the appeal tribunal in June, Eddington claimed conscientious objector status, which was not recognized and would have ended his exemption in August 1918. A further two hearings took place in June and July, respectively. Eddington's personal statement at the June hearing about his objection to war based on religious grounds is on record. The Astronomer Royal, Sir Frank Dyson, supported Eddington at the July hearing with a written statement, emphasising Eddington's essential role in the solar eclipse expedition to Príncipe in May 1919. Eddington made clear his willingness to serve in the Friends' Ambulance Unit, under the jurisdiction of the British Red Cross, or as a harvest labourer. However, the tribunal's decision to grant a further twelve months' exemption from military service was on condition of Eddington continuing his astronomy work, in particular in preparation for the Príncipe expedition. The war ended before the end of his exemption.
After the war, Eddington travelled to the island of Príncipe off the west coast of Africa to watch the solar eclipse of 29 May 1919. During the eclipse, he took pictures of the stars (several stars in the Hyades cluster, including Kappa Tauri of the constellation Taurus) whose line of sight from the Earth happened to be near the Sun's location in the sky at that time of year. This effect is noticeable only during a total solar eclipse when the sky is dark enough to see stars which are normally obscured by the Sun's brightness. According to the theory of general relativity, stars with light rays that passed near the Sun would appear to have been slightly shifted because their light had been curved by its gravitational field. Eddington showed that Newtonian gravitation could be interpreted to predict half the shift predicted by Einstein. Eddington's observations published the next year allegedly confirmed Einstein's theory, and were hailed at the time as evidence of general relativity over the Newtonian model. The news was reported in newspapers all over the world as a major story. Afterward, Eddington embarked on a campaign to popularize relativity and the expedition as landmarks both in scientific development and international scientific relations.
It has been claimed that Eddington's observations were of poor quality, and he had unjustly discounted simultaneous observations at Sobral, Brazil, which appeared closer to the Newtonian model, but a 1979 re-analysis with modern measuring equipment and contemporary software validated Eddington's results and conclusions. The quality of the 1919 results was indeed poor compared to later observations, but was sufficient to persuade contemporary astronomers. The rejection of the results from the expedition to Brazil was due to a defect in the telescopes used which, again, was completely accepted and well understood by contemporary astronomers. Throughout this period, Eddington lectured on relativity, and was particularly well known for his ability to explain the concepts in lay terms as well as scientific. He collected many of these into the "Mathematical Theory of Relativity" in 1923, which Albert Einstein suggested was "the finest presentation of the subject in any language." He was an early advocate of Einstein's general relativity, and an interesting anecdote well illustrates his humour and personal intellectual investment: Ludwik Silberstein, a physicist who thought of himself as an expert on relativity, approached Eddington at the Royal Society's (6 November) 1919 meeting where he had defended Einstein's relativity with his Brazil-Príncipe solar eclipse calculations with some degree of scepticism, and ruefully charged Arthur as one who claimed to be one of three men who actually understood the theory (Silberstein, of course, was including himself and Einstein as the other). When Eddington refrained from replying, he insisted Arthur not be "so shy", whereupon Eddington replied, "Oh, no! I was wondering who the third one might be!"
Cosmology. Eddington was also heavily involved with the development of the first generation of general relativistic cosmological models. He had been investigating the instability of the Einstein universe when he learned of both Lemaître's 1927 paper postulating an expanding or contracting universe and Hubble's work on the recession of the spiral nebulae. He felt the cosmological constant must have played the crucial role in the universe's evolution from an Einsteinian steady state to its current expanding state, and most of his cosmological investigations focused on the constant's significance and characteristics. In "The Mathematical Theory of Relativity," Eddington interpreted the cosmological constant to mean that the universe is "self-gauging". Fundamental theory and the Eddington number. During the 1920s until his death, Eddington increasingly concentrated on what he called "fundamental theory" which was intended to be a unification of quantum theory, relativity, cosmology, and gravitation. At first he progressed along "traditional" lines, but turned increasingly to an almost numerological analysis of the dimensionless ratios of fundamental constants.
His basic approach was to combine several fundamental constants in order to produce a dimensionless number. In many cases these would result in numbers close to 1040, its square, or its square root. He was convinced that the mass of the proton and the charge of the electron were a "natural and complete specification for constructing a Universe" and that their values were not accidental. One of the discoverers of quantum mechanics, Paul Dirac, also pursued this line of investigation, which has become known as the Dirac large numbers hypothesis. A somewhat damaging statement in his defence of these concepts involved the fine-structure constant, "α". At the time it was measured to be very close to 1/136, and he argued that the value should in fact be exactly 1/136 for epistemological reasons. Later measurements placed the value much closer to 1/137, at which point he switched his line of reasoning to argue that one more should be added to the degrees of freedom, so that the value should in fact be exactly 1/137, the Eddington number. at the time started calling him "Arthur Adding-one". This change of stance detracted from Eddington's credibility in the physics community. The current CODATA value is 1/
Eddington believed he had identified an algebraic basis for fundamental physics, which he termed "E-numbers" (representing a certain group – a Clifford algebra). These in effect incorporated spacetime into a higher-dimensional structure. While his theory has long been neglected by the general physics community, similar algebraic notions underlie many modern attempts at a grand unified theory. Moreover, Eddington's emphasis on the values of the fundamental constants, and specifically upon dimensionless numbers derived from them, is nowadays a central concern of physics. In particular, he predicted a number of hydrogen atoms in the Universe ≈ , or equivalently the half of the total number of particles protons + electrons. He did not complete this line of research before his death in 1944; his book "Fundamental Theory" was published posthumously in 1948. Eddington number for cycling. Eddington is credited with devising a measure of a cyclist's long-distance riding achievements. The Eddington number in the context of cycling is defined as the maximum number E such that the cyclist has cycled at least E miles on at least E days.
For example, an Eddington number of 70 would imply that the cyclist has cycled at least 70 miles in a day on at least 70 occasions. Achieving a high Eddington number is difficult, since moving from, say, 70 to 75 will (probably) require more than five new long-distance rides, since any rides shorter than 75 miles will no longer be included in the reckoning. Eddington's own life-time E-number was 84. The Eddington number for cycling is analogous to the "h"-index that quantifies both the actual scientific productivity and the apparent scientific impact of a scientist. Philosophy. Idealism. Eddington wrote in his book "The Nature of the Physical World" that "The stuff of the world is mind-stuff." The idealist conclusion was not integral to his epistemology but was based on two main arguments. The first derives directly from current physical theory. Briefly, mechanical theories of the ether and of the behaviour of fundamental particles have been discarded in both relativity and quantum physics. From this, Eddington inferred that a materialistic metaphysics was outmoded and that, in consequence, since the disjunction of materialism or idealism are assumed to be exhaustive, an idealistic metaphysics is required. The second, and more interesting argument, was based on Eddington's epistemology, and may be regarded as consisting of two parts. First, all we know of the objective world is its structure, and the structure of the objective world is precisely mirrored in our own consciousness. We therefore have no reason to doubt that the objective world too is "mind-stuff". Dualistic metaphysics, then, cannot be evidentially supported.
But, second, not only can we not know that the objective world is nonmentalistic, we also cannot intelligibly suppose that it could be material. To conceive of a dualism entails attributing material properties to the objective world. However, this presupposes that we could observe that the objective world has material properties. But this is absurd, for whatever is observed must ultimately be the content of our own consciousness, and consequently, nonmaterial. Eddington believed that physics cannot explain consciousness - "light waves are propagated from the table to the eye; chemical changes occur in the retina; propagation of some kind occurs in the optic nerves; atomic changes follow in the brain. Just where the final leap into consciousness occurs is not clear. We do not know the last stage of the message in the physical world before it became a sensation in consciousness". Ian Barbour, in his book "Issues in Science and Religion" (1966), p. 133, cites Eddington's "The Nature of the Physical World" (1928) for a text that argues the Heisenberg uncertainty principle provides a scientific basis for "the defense of the idea of human freedom" and his "Science and the Unseen World" (1929) for support of philosophical idealism, "the thesis that reality is basically mental".
Charles De Koninck points out that Eddington believed in objective reality existing apart from our minds, but was using the phrase "mind-stuff" to highlight the inherent intelligibility of the world: that our minds and the physical world are made of the same "stuff" and that our minds are the inescapable connection to the world. As De Koninck quotes Eddington, Science. Against Albert Einstein and others who advocated determinism, indeterminism—championed by Eddington—says that a physical object has an ontologically undetermined component that is not due to the epistemological limitations of physicists' understanding. The uncertainty principle in quantum mechanics, then, would not necessarily be due to hidden variables but to an indeterminism in nature itself. Eddington proclaimed "It is a consequence of the advent of the quantum theory that physics is no longer pledged to a scheme of deterministic law". Eddington agreed with the tenet of logical positivism that "the meaning of a scientific statement is to be ascertained by reference to the steps which would be taken to verify it".
Popular and philosophical writings. Eddington wrote a parody of "The Rubaiyat of Omar Khayyam", recounting his 1919 solar eclipse experiment. It contained the following quatrain: In addition to his textbook "The Mathematical Theory of Relativity", during the 1920s and 30s, Eddington gave numerous lectures, interviews, and radio broadcasts on relativity, and later, quantum mechanics. Many of these were gathered into books, including "The Nature of the Physical World" and "New Pathways in Science". His use of literary allusions and humour helped make these difficult subjects more accessible. One familiar image drawn by Eddington consisted of his "two tables", which represent a paradox concerned with what really exists: one table is the familiar and commonplace one, with properties of extension, colour, and permanence, it is "substantial" in the sense that it is constituted of "substance"; the other is his 'scientific' one, nothing but myriad minute particles in empty space: the table which "modern physics has by delicate test and remorseless logic assured me . . . is the only one which is really there ... wherever 'there' may be." He began the lectures where he discussed this paradox in 1927 with an allusion to these two tables: The second table is mostly emptiness, with numerous electric charges moving around at great speed, and this table is not "substantial" in any way. Eddington portrays the two tables as a recent innovation: physicists "used to borrow the raw material of [their] world from the familiar world", but for the new concepts, such as the electron, quantum or potential, there is no "familiar counterpart to these things" in "the world of commonplace experience".
Eddington's books and lectures were immensely popular with the public, not only because of his clear exposition, but also for his willingness to discuss the philosophical and religious implications of the new physics. He argued for a deeply rooted philosophical harmony between scientific investigation and religious mysticism, and also that the positivist nature of relativity and quantum physics provided new room for personal religious experience and free will. Unlike many other spiritual scientists, he rejected the idea that science could provide proof of religious propositions. His popular writings made him a household name in Great Britain between the world wars. Death. Eddington died of cancer in the Evelyn Nursing Home, Cambridge, on 22 November 1944. He was unmarried. His body was cremated at Cambridge Crematorium (Cambridgeshire) on 27 November 1944; the cremated remains were buried in the grave of his mother in the Ascension Parish Burial Ground in Cambridge. Cambridge University's North West Cambridge development has been named Eddington in his honour.
Eddington was played by David Tennant in the television film "Einstein and Eddington", with Einstein played by Andy Serkis. The film was notable for its groundbreaking portrayal of Eddington as a somewhat repressed gay man. It was first broadcast in 2008. The actor Paul Eddington was a relative, mentioning in his autobiography (in light of his own weakness in mathematics) "what I then felt to be the misfortune" of being related to "one of the foremost physicists in the world". Paul's father Albert and Sir Arthur were second cousins, both great-grandsons of William Eddington (1755–1806).
Apple II (original) The Apple II (stylized as ) is a personal computer released by Apple Inc. in June 1977. It was one of the first successful mass-produced microcomputer products and is widely regarded as one of the most important personal computers of all time due to its role in popularizing home computing and influencing later software development. The Apple II was designed primarily by Steve Wozniak. The system is based around the 8-bit MOS Technology 6502 microprocessor. Jerry Manock designed the foam-molded plastic case, Rod Holt developed the switching power supply, while Steve Jobs was not involved in the design of the computer. It was introduced by Jobs and Wozniak at the 1977 West Coast Computer Faire, and marks Apple's first launch of a computer aimed at a consumer market—branded toward American households rather than businessmen or computer hobbyists. "Byte" magazine referred to the Apple II, Commodore PET 2001, and TRS-80 as the "1977 Trinity". As the Apple II had the defining feature of being able to display color graphics, the Apple logo was redesigned to have a spectrum of colors.
The Apple II was the first in a series of computers collectively referred to by the Apple II name. It was followed by the Apple II+, Apple IIe, Apple IIc, Apple IIc Plus, and the 16-bit Apple IIGS—all of which remained compatible. Production of the last available model, the Apple IIe, ceased in November 1993. History. By 1976, Steve Jobs had convinced product designer Jerry Manock (who had formerly worked at Hewlett Packard designing calculators) to create the "shell" for the Apple II—a smooth case inspired by kitchen appliances that concealed the internal mechanics. The earliest Apple II computers were assembled in Silicon Valley and later in Texas; printed circuit boards were manufactured in Ireland and Singapore. The first computers went on sale on June 10, 1977 with an MOS Technology 6502 microprocessor running at 1.023 MHz ( of the NTSC color subcarrier), two game paddles (bundled until 1980, when they were found to violate FCC regulations), 4 KiB of RAM, an audio cassette interface for loading programs and storing data, and the Integer BASIC programming language built into ROMs. The video controller displayed 24 lines by 40 columns of monochrome, uppercase-only text on the screen (the original character set matches ASCII characters 20h to 5Fh), with NTSC composite video output suitable for display on a video monitor or on a regular TV set (by way of a separate RF modulator).
The original retail price of the computer with 4 KiB of RAM was and with the maximum 48 KiB of RAM, it was To reflect the computer's color graphics capability, the Apple logo on the casing has rainbow stripes, which remained a part of Apple's corporate logo until early 1998. Perhaps most significantly, the Apple II was a catalyst for personal computers across many industries; it opened the doors to software marketed at consumers. Certain aspects of the system's design were influenced by Atari, Inc.'s arcade video game "Breakout" (1976), which was designed by Wozniak, who said: "A lot of features of the Apple II went in because I had designed "Breakout" for Atari. I had designed it in hardware. I wanted to write it in software now". This included his design of color graphics circuitry, the addition of game paddle support and sound, and graphics commands in Integer BASIC, with which he wrote "Brick Out", a software clone of his own hardware game. Wozniak said in 1984: "Basically, all the game features were put in just so I could show off the game I was familiar with—"Breakout"—at the Homebrew Computer Club. It was the most satisfying day of my life [when] I demonstrated "Breakout"—totally written in BASIC. It seemed like a huge step to me. After designing hardware arcade games, I knew that being able to program them in BASIC was going to change the world."
Overview. In the May 1977 issue of "Byte", Steve Wozniak published a detailed description of his design; the article began, "To me, a personal computer should be small, reliable, convenient to use, and inexpensive." The Apple II used peculiar engineering shortcuts to save hardware and reduce costs, such as: The text and graphics screens have a complex arrangement. For instance, the scanlines were not stored in sequential areas of memory. This complexity was reportedly due to Wozniak's realization that the method would allow for the refresh of dynamic RAM as a side effect (as described above). This method had no cost overhead to have software calculate or look up the address of the required scanline and avoided the need for significant extra hardware. Similarly, in high-resolution graphics mode, color is determined by pixel position and thus can be implemented in software, saving Wozniak the chips needed to convert bit patterns to colors. This also allowed the ability to draw text with subpixel rendering, since orange and blue pixels appear half a pixel-width farther to the right on the screen than green and purple pixels.
The Apple II at first used data cassette storage, like most other microcomputers of the time. In 1978, the company introduced an external -inch floppy disk drive, called Disk II (stylized as Disk ][), attached through a controller card that plugs into one of the computer's expansion slots (usually slot 6). The Disk II interface, created by Wozniak, is regarded as an engineering masterpiece for its economy of electronic components. The approach taken in the Disk II controller is typical of Wozniak's designs. With a few small-scale logic chips and a cheap PROM (programmable read-only memory), he created a functional floppy disk interface at a fraction of the component cost of standard circuit configurations. Case design. The first production Apple II computers had hand-molded cases; these had visible bubbles and other lumps in them from the imperfect plastic molding process, which was soon switched to machine molding. In addition, the initial case design had no vent openings, causing high heat buildup from the PCB and resulting in the plastic softening and sagging. Apple added vent holes to the case within three months of production; customers with the original case could have them replaced at no charge.
PCB revisions. The Apple II's printed circuit board (PCB) underwent several revisions, as Steve Wozniak made modifications to it. The earliest version was known as Revision 0, and the first 6,000 units shipped used it. Later revisions added a color killer circuit to prevent color fringing when the computer was in text mode, as well as modifications to improve the reliability of cassette I/O. Revision 0 Apple IIs powered up in an undefined mode and had garbage on-screen, requiring the user to press Reset. This was eliminated in later board revisions. Revision 0 Apple IIs could display only four colors in hi-res mode, but Wozniak was able to increase this to six hi-res colors on later board revisions. (Technically it was eight, but only six were visible.) The PCB had three RAM banks for a total of 24 RAM chips. Original Apple IIs had jumper switches to adjust RAM size, and RAM configurations could be 4, 8, 12, 16, 20, 24, 32, 36, or 48 KiB. The three smallest memory configurations used 4kx1 DRAMs, with larger ones using 16kx1 DRAMs, or mix of 4-kilobyte and 16-kilobyte banks (the chips in any one bank have to be the same size). The early Apple II+ models retained this feature, but after a drop in DRAM prices, Apple redesigned the circuit boards without the jumpers, so that only 16kx1 chips were supported. A few months later, they started shipping all machines with a full 48 KiB complement of DRAM.
Unlike most machines, all integrated circuits on the Apple II PCB were socketed; although this cost more to manufacture and created the possibility of loose chips causing a system malfunction, it was considered preferable to make servicing and replacement of bad chips easier. The Apple II PCB lacks any means of generating an interrupt request, although expansion cards may generate one. Program code had to stop everything to perform any I/O task; like many of the computer's other idiosyncrasies, this was due to cost reasons and Steve Wozniak assuming interrupts were not needed for gaming or using the computer as a teaching tool. Display and graphics. Color on the Apple II series uses a quirk of the NTSC television signal standard, which made color display relatively easy and inexpensive to implement. The original NTSC television signal specification was black and white. Color was added later by adding a 3.58-megahertz subcarrier signal that was partially ignored by black-and-white TV sets. Color is encoded based on the phase of this signal in relation to a reference color burst signal. The result is that the position, size, and intensity of a series of pulses define color information. These pulses can translate into pixels on the computer screen, with the possibility of exploiting composite artifact colors.
The Apple II display provides two pixels per subcarrier cycle. When the color burst reference signal is turned on and the computer attached to a color display, it can display green by showing one alternating pattern of pixels, magenta with an opposite pattern of alternating pixels, and white by placing two pixels next to each other. Blue and orange are available by tweaking the pixel offset by half a pixel-width in relation to the color-burst signal. The high-resolution display offers more colors by compressing more (and narrower) pixels into each subcarrier cycle. The coarse, low-resolution graphics display mode works differently, as it can output a pattern of dots per pixel to offer more color options. These patterns are stored in the character generator ROM, and replace the text character bit patterns when the computer is switched to low-res graphics mode. The text mode and low-res graphics mode use the same memory region and the same circuitry is used for both. A single HGR page occupied 8 KiB of RAM; in practice this meant that the user had to have at least 12 KiB of total RAM to use HGR mode and 20 KiB to use two pages. Early Apple II games from the 1977–79 period often ran only in text or low-resolution mode in order to support users with small memory configurations; HGR not being near universally supported by games until 1980.
Sound. Rather than a dedicated sound-synthesis chip, the Apple II contains a toggle circuit that can only emit a click through a built-in speaker or a line-out jack. More complex sounds, such as music or audio samples, are generated by software manually toggling the speaker at an appropriate frequency. This technique requires careful and precise timing, rendering it difficult to display moving graphics while sound is playing. Third party expansion cards were later released which addressed this problem. A similar technique is used for cassette storage: cassette output works the same as the speaker, and input uses a simple zero-crossing detector as a 1-bit audio digitizer. Routines in machine ROM encode and decode data in frequency-shift keying for the cassette. Programming languages. Initially, the Apple II was shipped with Integer BASIC encoded in the motherboard ROM chips. Written by Wozniak, the interpreter enabled users to write software applications without needing to purchase additional development utilities. Written with game programmers and hobbyists in mind, the language only supported the encoding of numbers in 16-bit integer format. Since it only supported integers between -32768 and +32767 (signed 16-bit integer), it was less suitable to business software, and Apple soon received complaints from customers. Because Steve Wozniak was busy developing the Disk II hardware, he did not have time to modify Integer BASIC for floating point support. Apple instead licensed Microsoft's 6502 BASIC to create Applesoft BASIC.
Disk users normally purchased a so-called Language Card, which had Applesoft in ROM, and was located below the Integer BASIC ROM in system memory. The user could switch between either BASIC by typing or in BASIC prompt. Apple also offered a different version of Applesoft for cassette users, which occupied low memory, and was started by using the command in Integer BASIC. As shipped, Apple II incorporated a machine code monitor with commands for displaying and altering the computer's RAM, either one byte at a time, or in blocks of 256 bytes at once. This enabled programmers to write and debug machine code programs without further development software. The computer powers on into the monitor ROM, displaying a prompt. From there, enters BASIC, or a machine language program can be loaded from cassette. Disk software can be booted with followed by , referring to Slot 6 which normally contained the Disk II controller. A 6502 assembler was soon offered on disk, and later the UCSD compiler and operating system for the Pascal language were made available. The Pascal system requires a 16 KiB RAM card to be installed in the language card position (expansion slot 0) in addition to the full 48 KiB of motherboard memory.
Manual. The first 1,000 or so Apple IIs shipped in 1977 with a 68-page mimeographed "Apple II Mini Manual", hand-bound with brass paper fasteners. This was the basis for the "Apple II Reference Manual," which became known as the Red Book for its red cover, published in January 1978. All existing customers who sent in their warranty cards were sent free copies of the Red Book. The "Apple II Reference Manual" contained the complete schematic of the entire computer's circuitry, and a complete source listing of the "Monitor" ROM firmware that served as the machine's BIOS. An Apple II manual signed by Steve Jobs in 1980 with the inscription "Julian, your generation is the first to grow up with computers. Go change the world." sold at auction for $787,484 in 2021. Operating system. The original Apple II came with an 8 KiB ROM containing a BASIC variant called Integer BASIC as well as a resident monitor called the Apple System Monitor. Initially, only cassette tape was available for storage, which was considered too slow and unreliable for business use. In late 1977, Apple began to develop the Disk II floppy disk drive and required an operating system to utilize it. The existing standard at the time was CP/M, but due to incompatibility with the 6502 processor and a perceived clunkiness, Apple contracted Shepardson Microsystems for $13,000 to write Apple DOS. At Shepardson, Paul Laughton developed the software in just 35 days, a remarkably short deadline, even for the time. The Disk II and Apple DOS were released in late 1978. The final and most popular version of this software was Apple DOS 3.3.

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