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Developmental psychologyis thescientificstudy of how and whyhumansgrow, change, and adapt across the course of their lives. Originally concerned withinfantsandchildren, the field has expanded to includeadolescence,adult development,aging, and the entire lifespan.[1]Developmental psychologists aim to explain howthinking... | https://en.wikipedia.org/wiki/Developmental_psychology |
Finger-counting, also known asdactylonomy, is the act ofcountingusing one's fingers. There are multiple different systems used across time and between cultures, though many of these have seen a decline in use because of the spread ofArabic numerals.
Finger-counting can serve as a form ofmanual communication, particula... | https://en.wikipedia.org/wiki/Finger_counting |
Thehistory of mathematicsdeals with the origin of discoveries inmathematicsand themathematical methods and notation of the past. Before themodern ageand the worldwide spread of knowledge, written examples of new mathematical developments have come to light only in a few locales. From 3000 BC theMesopotamianstates ofSum... | https://en.wikipedia.org/wiki/History_of_mathematics |
Jetonsorjettonsaretokensorcoin-like medals produced across Europe from the 13th through the 18th centuries. They were produced as counters for use in calculation on acounting board, a lined board similar to anabacus. Jetons for calculation were commonly used in Europe from about 1200 to 1700,[1]and remained in occasion... | https://en.wikipedia.org/wiki/Jeton |
Level of measurementorscale of measureis a classification that describes the nature of information within the values assigned tovariables.[1]PsychologistStanley Smith Stevensdeveloped the best-known classification with four levels, or scales, of measurement:nominal,ordinal,interval, andratio.[1][2]This framework of dis... | https://en.wikipedia.org/wiki/Level_of_measurement |
This is a list of notablenumbersand articles about notable numbers. The list does not contain all numbers in existence as most of thenumber setsare infinite. Numbers may be included in the list based on their mathematical, historical or cultural notability, but all numbers have qualities that could arguably make them n... | https://en.wikipedia.org/wiki/List_of_numbers |
Quantityoramountis a property that can exist as amultitudeormagnitude, which illustratediscontinuityandcontinuity. Quantities can be compared in terms of "more", "less", or "equal", or by assigning a numerical value multiple of aunit of measurement.Mass,time,distance,heat, andangleare among the familiar examples of qua... | https://en.wikipedia.org/wiki/Mathematical_quantity |
Inthermodynamics, theparticle number(symbolN) of athermodynamic systemis thenumberof constituentparticlesin that system.[1]The particle number is a fundamentalthermodynamic propertywhich isconjugateto thechemical potential. Unlike mostphysical quantities, the particle number is adimensionless quantity, specifically aco... | https://en.wikipedia.org/wiki/Particle_number |
Subitizingis the rapid, accurate, and effortless ability to perceive small quantities of items in aset, typically when there are four or fewer items, without relying on linguistic or arithmetic processes. The term refers to the sensation of instantly knowing how many objects are in the visual scene when their number fa... | https://en.wikipedia.org/wiki/Subitizing_and_counting |
Tally marks, also calledhash marks, are a form ofnumeralused forcounting. They can be thought of as aunary numeral system.
They are most useful incountingor tallying ongoing results, such as thescorein a game or sport, as no intermediate results need to be erased or discarded. However, because of the length of large n... | https://en.wikipedia.org/wiki/Tally_mark |
Yan Tan Tetheraoryan-tan-tetherais a sheep-counting system traditionally used byshepherdsinYorkshire,Northern Englandand some other parts ofBritain.[1]The words may be derived from numbers inBrythonic Celticlanguages such asCumbricwhich had died out in most of Northern England by the sixth century, but they were common... | https://en.wikipedia.org/wiki/Yan_tan_tethera |
TheBanach–Tarski paradoxis atheoreminset-theoreticgeometry, which states the following: Given a solidballinthree-dimensional space,there existsa decomposition of the ball into a finite number ofdisjointsubsets, which can then be put back together in a different way to yield two identical copies of the original ball. In... | https://en.wikipedia.org/wiki/Banach%E2%80%93Tarski_paradox |
Galileo's paradoxis a demonstration of one of the surprising properties ofinfinite sets. In his final scientific work,Two New Sciences,Galileo Galileimade apparently contradictory statements about thepositive integers. First, a square is an integer which is the square of an integer. Some numbers aresquares, while other... | https://en.wikipedia.org/wiki/Galileo%27s_paradox |
This article contains a discussion ofparadoxes of set theory. As with most mathematicalparadoxes, they generally reveal surprising and counter-intuitive mathematical results, rather than actual logicalcontradictionswithin modernaxiomatic set theory.
Set theoryas conceived byGeorg Cantorassumes the existence of infinit... | https://en.wikipedia.org/wiki/Paradoxes_of_set_theory |
Inmathematics, theepsilon numbersare a collection oftransfinite numberswhose defining property is that they arefixed pointsof anexponential map. Consequently, they are not reachable from 0 via a finite series of applications of the chosen exponential map and of "weaker" operations like addition and multiplication. The... | https://en.wikipedia.org/wiki/Epsilon_numbers_(mathematics) |
In the mathematical discipline ofset theory, there are many ways of describing specificcountableordinals. The smallest ones can be usefully and non-circularly expressed in terms of theirCantor normal forms. Beyond that, many ordinals of relevance toproof theorystill havecomputableordinal notations(seeordinal analysis).... | https://en.wikipedia.org/wiki/Large_countable_ordinal |
In themathematicalfield ofset theory,ordinal arithmeticdescribes the three usual operations onordinal numbers:addition,multiplication, andexponentiation. Each can be defined in essentially two different ways: either by constructing an explicitwell-ordered setthat represents the result of the operation or by usingtransf... | https://en.wikipedia.org/wiki/Ordinal_arithmetic |
In mathematicalset theory,Cantor's theoremis a fundamental result which states that, for anysetA{\displaystyle A}, the set of allsubsetsofA,{\displaystyle A,}known as thepower setofA,{\displaystyle A,}has a strictly greatercardinalitythanA{\displaystyle A}itself.
Forfinite sets, Cantor's theorem can be seen to be true... | https://en.wikipedia.org/wiki/Cantor%27s_theorem |
Theabsolute infinite(symbol:Ω), in context often called "absolute", is an extension of the idea ofinfinityproposed bymathematicianGeorg Cantor. Cantor linked the absolute infinite withGod,[1][2]: 175[3]: 556and believed that it had variousmathematicalproperties, including thereflection principle: every property of the ... | https://en.wikipedia.org/wiki/Absolute_infinite |
Inmathematics, thecardinalityof asetis the number of its elements. The cardinality of a set may also be called itssize, when no confusion with other notions of size is possible.[a]Beginning in the late 19th century, this concept of size was generalized toinfinite sets, allowing one to distinguish between different type... | https://en.wikipedia.org/wiki/Cardinality |
Inset theory,Ω-logicis aninfinitary logicanddeductive systemproposed byW. Hugh Woodin(1999) as part of an attempt to generalize the theory ofdeterminacyofpointclassesto coverthe structureHℵ2{\displaystyle H_{\aleph _{2}}}. Just as theaxiom of projective determinacyyields a canonical theory ofHℵ1{\displaystyle H_{\aleph... | https://en.wikipedia.org/wiki/%CE%A9-logic |
Thesecond continuum hypothesis, also calledLuzin's hypothesisorLuzin's second continuum hypothesis, is the hypothesis that2ℵ0=2ℵ1{\displaystyle 2^{\aleph _{0}}=2^{\aleph _{1}}}. It is the negation ofa weakened form,2ℵ0<2ℵ1{\displaystyle 2^{\aleph _{0}}<2^{\aleph _{1}}}, of theContinuum Hypothesis(CH). It was discus... | https://en.wikipedia.org/wiki/Second_continuum_hypothesis |
Inmathematics,Wetzel's problemconcerns bounds on thecardinalityof a set ofanalytic functionsthat, for each of their arguments, take on few distinct values. It is named after John Wetzel, a mathematician at theUniversity of Illinois at Urbana–Champaign.[1][2]
LetFbe a family of distinct analytic functions on a givendom... | https://en.wikipedia.org/wiki/Wetzel%27s_problem |
In thephilosophy of mathematics, thepre-intuitionistsis the name given byL. E. J. Brouwerto several influential mathematicians who shared similar opinions on the nature of mathematics. The term was introduced by Brouwer in his 1951 lectures atCambridgewhere he described the differences between his philosophy ofintuitio... | https://en.wikipedia.org/wiki/Preintuitionism |
Indirect self-referencedescribes an objectreferring to itselfindirectly. For example, the "this sentence is false." contains a direct self-reference, in which the phrase "this sentence" refers directly to the sentence as a whole. An indirectly self-referential sentence would replace the phrase "this sentence" with an e... | https://en.wikipedia.org/wiki/Indirect_self-reference |
Inmathematics, afixed-point theoremis a result saying that afunctionFwill have at least onefixed point(a pointxfor whichF(x) =x), under some conditions onFthat can be stated in general terms.[1]
TheBanach fixed-point theorem(1922) gives a general criterion guaranteeing that, if it is satisfied, the procedure ofiterati... | https://en.wikipedia.org/wiki/List_of_fixed_point_theorems |
This list includes well known paradoxes, grouped thematically. The grouping is approximate, as paradoxes may fit into more than one category. This list collects only scenarios that have been called aparadoxby at least one source and have their own article in this encyclopedia. These paradoxes may be due to fallacious r... | https://en.wikipedia.org/wiki/Self-referential_paradoxes |
Incalculus,Newton's method(also calledNewton–Raphson) is aniterative methodfor finding therootsof adifferentiable functionf{\displaystyle f}, which are solutions to theequationf(x)=0{\displaystyle f(x)=0}. However, to optimize a twice-differentiablef{\displaystyle f}, our goal is to find the roots off′{\displaystyle f'... | https://en.wikipedia.org/wiki/Newton%27s_method_in_optimization |
Thegolden-section searchis a technique for finding anextremum(minimum or maximum) of a function inside a specified interval. For a strictlyunimodal functionwith an extremum inside the interval, it will find that extremum, while for an interval containing multiple extrema (possibly including the interval boundaries), it... | https://en.wikipedia.org/wiki/Golden-section_search |
Incomputer science,binary search, also known ashalf-interval search,[1]logarithmic search,[2]orbinary chop,[3]is asearch algorithmthat finds the position of a target value within asorted array.[4][5]Binary search compares the target value to the middle element of the array. If they are not equal, the half in which the ... | https://en.wikipedia.org/wiki/Binary_search_algorithm |
Interpolation searchis analgorithmforsearchingfor a key in an array that has beenorderedby numerical values assigned to the keys (key values). It was first described by W. W. Peterson in 1957.[1]Interpolation search resembles the method by which people search atelephone directoryfor a name (the key value by which the b... | https://en.wikipedia.org/wiki/Interpolation_search |
Incomputer science, anexponential search(also calleddoubling searchorgalloping searchorStruzik search)[1]is analgorithm, created byJon BentleyandAndrew Chi-Chih Yaoin 1976, for searching sorted, unbounded/infinite lists.[2]There are numerous ways to implement this, with the most common being to determine a range that t... | https://en.wikipedia.org/wiki/Exponential_search |
Asearch gameis a two-personzero-sum gamewhich takes place in asetcalled the search space. The searcher can choose any continuous trajectory subject to a maximal velocity constraint. It is always assumed that neither the searcher nor the hider has any knowledge about the movement of the other player until their distance... | https://en.wikipedia.org/wiki/Search_games |
Algorithmic artoralgorithm artis art, mostlyvisual art, in which the design is generated by analgorithm. Algorithmic artists are sometimes called algorists. Algorithmic art is created in the form of digital paintings andsculptures,interactive installationsandmusic compositions.[2]
Algorithmic art is not a newconcept.... | https://en.wikipedia.org/wiki/Algorithmic_art |
TheHindu–Arabic numeral system(also known as theIndo-Arabic numeral system,[1]Hindu numeral system, andArabic numeral system)[2][note 1]is apositionalbase-tennumeral systemfor representingintegers; its extension to non-integers is thedecimal numeral system, which is presently the most common numeral system.
The system... | https://en.wikipedia.org/wiki/Hindu%E2%80%93Arabic_numeral_system |
TheHindu–Arabic numeral systemis a decimalplace-valuenumeral system that uses azeroglyph as in "205".[1]
Its glyphs are descended from the IndianBrahmi numerals. The full system emerged by the 8th to 9th centuries, and is first described outside India inAl-Khwarizmi'sOn the Calculation with Hindu Numerals(ca. 825), an... | https://en.wikipedia.org/wiki/History_of_the_Hindu%E2%80%93Arabic_numeral_system |
Johannes de Sacrobosco, also writtenIoannes de Sacro Bosco, later calledJohn of HolywoodorJohn of Holybush(c.1195 –c.1256), was ascholar,Catholic monk, andastronomerwho taught at theUniversity of Paris.
He wrote a short introduction to the Hindu-Arabic numeral system. Judging from the number of manuscript copies that ... | https://en.wikipedia.org/wiki/Johannes_de_Sacrobosco |
Positional notation, also known asplace-value notation,positional numeral system, or simplyplace value, usually denotes the extension to anybaseof theHindu–Arabic numeral system(ordecimal system). More generally, a positional system is anumeral systemin which the contribution of a digit to the value of a number is the ... | https://en.wikipedia.org/wiki/Positional_notation |
Aternary/ˈtɜːrnəri/numeral system(also calledbase 3ortrinary[1]) hasthreeas itsbase. Analogous to abit, a ternarydigitis atrit(trinary digit). One trit is equivalent tolog23 (about 1.58496) bits ofinformation.
Althoughternarymost often refers to a system in which the three digits are all non–negative numbers; specific... | https://en.wikipedia.org/wiki/Binary-coded_ternary |
TheIEEE 754-2008standard includes decimal floating-point number formats in which thesignificandand the exponent (and the payloads ofNaNs) can be encoded in two ways, referred to asbinary encodinganddecimal encoding.[1]
Both formats break a number down into a sign bits, an exponentq(betweenqminandqmax), and ap-digit si... | https://en.wikipedia.org/wiki/Binary_integer_decimal |
Incomputer science, amaskorbitmaskis data that is used forbitwise operations, particularly in abit field. Using a mask, multiple bits in abyte,nibble,word, etc. can be set either on or off, or inverted from on to off (or vice versa) in a single bitwise operation. An additional use of masking involvespredicationinvecto... | https://en.wikipedia.org/wiki/Bitmask |
Chen–Ho encodingis a memory-efficient alternate system ofbinaryencoding fordecimaldigits.
The traditional system of binary encoding for decimal digits, known asbinary-coded decimal(BCD), uses four bits to encode each digit, resulting in significant wastage of binary data bandwidth (since four bits can store 16 states ... | https://en.wikipedia.org/wiki/Chen%E2%80%93Ho_encoding |
Incomputer science, thedouble dabblealgorithmis used to convertbinary numbersintobinary-coded decimal(BCD) notation.[1][2]It is also known as theshift-and-add-3 algorithm, and can be implemented using a small number of gates in computer hardware, but at the expense of highlatency.[3]
The algorithm operates as follows:... | https://en.wikipedia.org/wiki/Double_dabble |
The termyear 2000 problem,[1]or simplyY2K, refers to potential computer errors related to theformatting and storage of calendar datafor dates in and after the year2000. Manyprogramsrepresented four-digit years with only the final two digits, making the year 2000 indistinguishable from 1900. Computer systems' inability ... | https://en.wikipedia.org/wiki/Year_2000_problem |
Classificationis the activity of assigning objects to some pre-existing classes or categories. This is distinct from the task of establishing the classes themselves (for example throughcluster analysis).[1]Examples include diagnostic tests, identifying spam emails and deciding whether to give someone a driving license.... | https://en.wikipedia.org/wiki/Classification |
Aternary computer, also calledtrinary computer, is one that usesternary logic(i.e.,base 3) instead of the more commonbinary system(i.e.,base 2) in its calculations. Ternary computers use trits, instead of binarybits.
Ternary computing deals with three discrete states, but the ternary digits themselves can be defined d... | https://en.wikipedia.org/wiki/Ternary_computer |
The12-hour clockis a time convention in which the 24 hours of the day are divided into two periods:a.m.(fromLatinante meridiem, translating to "before midday") andp.m.(from Latinpost meridiem, translating to "after midday").[1][2]Each period consists of 12 hours numbered: 12 (acting as 0),[3]1, 2, 3, 4, 5, 6, 7, 8, 9, ... | https://en.wikipedia.org/wiki/12-hour_clock |
The modern24-hour clockis the convention oftimekeepingin which thedayruns frommidnightto midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from00(:00)to23(:59), with24(:00)as an option to indicate the end of the day. This system, as opposed to the12-hour clock, i... | https://en.wikipedia.org/wiki/24-hour_clock |
Intrigonometry, thegradian– also known as thegon(fromAncient Greekγωνία(gōnía)'angle'),grad, orgrade[1]– is aunit of measurementof anangle, defined as one-hundredth of theright angle; in other words, 100 gradians is equal to 90 degrees.[2][3][4]It is equivalent to1/400of aturn,[5]9/10of adegree, orπ/200of aradian... | https://en.wikipedia.org/wiki/Centesimal_minute_and_second_of_arc |
Adecimal calendaris a calendar which includesunits of timebased on thedecimal system. For example, a "decimal month" would consist of a year with 10 months and 36.52422 days per month.
The ancient Egyptian calendar consisted of twelve months, each divided into three weeks of ten days, with fiveintercalary days.[1]
Th... | https://en.wikipedia.org/wiki/Decimal_calendar |
Anunusual unit of measurementis aunit of measurementthat does not form part of a coherentsystem of measurement, especially because its exact quantity may not be well known or because it may be an inconvenient multiple or fraction of a base unit.
Many of the unusual units of measurements listed here are colloquial meas... | https://en.wikipedia.org/wiki/List_of_unusual_units_of_measurement |
Metric timeis the measure of time intervals using themetric system. The modernSIsystem defines thesecondas thebase unitof time, and forms multiples and submultiples withmetric prefixessuch as kiloseconds and milliseconds. Other units of time –minute,hour, andday– areaccepted for use with SI, but are not part of it. Met... | https://en.wikipedia.org/wiki/Metric_time |
Astardateis a fictional system of time measurement developed for the television and film seriesStar Trek. In the series, use of this date system is commonly heard at the beginning of avoice-overlog entry, such as "Captain's log, stardate 41153.7. Our destination is planet Deneb IV …". While the original method was insp... | https://en.wikipedia.org/wiki/Stardate |
Unix time[a]is a date and time representation widely used incomputing. It measures time by the number of non-leap secondsthat have elapsed since 00:00:00UTCon 1 January 1970, the Unixepoch. For example, at midnight on 1 January 2010, Unix time was 1262304000.
Unix time originated as thesystem timeofUnixoperating syste... | https://en.wikipedia.org/wiki/Unix_time |
Simon Stevin(Dutch:[ˈsimɔnsteːˈvɪn]; 1548–1620), sometimes calledStevinus, was aFlemishmathematician, scientist andmusic theorist.[1]He made various contributions in many areas ofscienceandengineering, both theoretical and practical. He also translated various mathematical terms intoDutch, making it one of the few Euro... | https://en.wikipedia.org/wiki/Simon_Stevin#Decimal_fractions |
Theinverted pyramidis ametaphorused byjournalistsand other writers to illustrate how information should be prioritised and structured inprose(e.g., a news report). It is a common method for writingnews storiesand has wide adaptability to other kinds of texts, such as blogs, editorial columns and marketing factsheets. I... | https://en.wikipedia.org/wiki/Inverted_pyramid_(journalism) |
Thedollar sign, also known as thepeso sign, is acurrency symbolconsisting of acapital⟨S⟩crossed with one or two vertical strokes ($ordepending ontypeface), used to indicate the unit of variouscurrenciesaround the world, including most currencies denominated "dollar" or "peso". The explicitly double-barredsign is called... | https://en.wikipedia.org/wiki/Cifr%C3%A3o |
Significant figures, also referred to assignificant digits, are specificdigitswithin a number that is written inpositional notationthat carry both reliability and necessity in conveying a particular quantity. When presenting the outcome of a measurement (such as length, pressure, volume, or mass), if the number of digi... | https://en.wikipedia.org/wiki/Decimal_place |
Scriptio continua(Latinfor 'continuous script'), also known asscriptura continuaorscripta continua, is a style of writing withoutspacesorother marksbetween the words or sentences. The form also lackspunctuation,diacritics, or distinguishedletter case.
In the West, the oldest Greek and Latin inscriptions usedword divid... | https://en.wikipedia.org/wiki/Scriptio_continua |
Rasm(Arabic:رَسْم[ræsm]) is an Arabic writing script often used in the early centuries ofClassical Arabicliterature (7th century – early 11th century AD). It is the same as today's Arabic script except for the difference that theArabic diacriticsare omitted. These diacritics include consonant pointing orʾiʿjām(إِعْجَام... | https://en.wikipedia.org/wiki/Rasm |
Inwriting, aspace() is a blank area thatseparates words,sentences, and other written or printedglyphs(characters). Conventions for spacing vary among languages, and in some languages the spacing rules are complex.[citation needed]Inter-word spaces ease the reader's task of identifying words, and avoid outright ambiguit... | https://en.wikipedia.org/wiki/Space_(punctuation) |
Dot-decimal notationis a presentation format for numerical data. It consists of a string of decimal numbers, using thefull stop(dot) as aseparation character.[1]
A common use of dot-decimal notation is in information technology where it is a method of writing numbers inoctet-grouped base-10 (decimal) numbers.[2]Incomp... | https://en.wikipedia.org/wiki/Dot-decimal_notation |
TheInternational System of Units, internationally known by the abbreviationSI(from FrenchSystème international d'unités), is the modern form of themetric systemand the world's most widely usedsystem of measurement. It is the only system of measurement with official status in nearly every country in the world, employed ... | https://en.wikipedia.org/wiki/International_System_of_Units |
International standardISO2145defines a typographic convention for the "numbering of divisions and subdivisions in written documents". It applies to any kind of document, including manuscripts, books, journal articles, and standards.
The ISO 2145 numbering scheme is defined by the following rules:
A table of contents ... | https://en.wikipedia.org/wiki/ISO_2145 |
TheRKM code,[1]also referred to as "letter and numeral code forresistanceandcapacitancevalues andtolerances",[1]"letter and digit code for resistance and capacitance values and tolerances",[2][3]or informally as "R notation"[4][5][6][7][8][9]is a notation to specifyresistorandcapacitorvalues defined in the internationa... | https://en.wikipedia.org/wiki/RKM_code |
Software versioningis the process of assigning either uniqueversion namesor uniqueversion numbersto unique states of computer software. Within a given version number category (e.g., major or minor), these numbers are generally assigned in increasing order and correspond to new developments in the software. At a fine-gr... | https://en.wikipedia.org/wiki/Version_numbering |
The standard circulatingcoinageof theUnited Kingdom,British Crown DependenciesandBritish Overseas Territoriesis denominated in pennies andpoundssterling(symbol "£", commercial GBP), and ranges in value fromone penny sterlingto two pounds. Sincedecimalisation, on 15 February 1971, the pound has been divided into 100 pen... | https://en.wikipedia.org/wiki/British_coinage |
Decimal Day(Irish:Lá Deachúil)[1]in the United Kingdom and inIrelandwas Monday 15 February 1971, the day on which each countrydecimalisedits respective£sdcurrencyofpounds,shillings, andpence.
Before this date, both the Britishpound sterlingand theIrish pound(symbol "£") were subdivided into 20 shillings, each of 12 (o... | https://en.wikipedia.org/wiki/Decimal_Day |
Metricationormetrificationis the act or process of converting to themetric systemof measurement.[1]All over the world, countries have transitioned from local and traditionalunits of measurementto the metric system. This process began inFrance during the 1790s, and has persistently advanced over two centuries, accumulat... | https://en.wikipedia.org/wiki/Metrication |
Anon-decimal currencyis acurrencythat has sub-units that are a non-decimal fraction of the main unit, i.e. the number of sub-units in a main unit is not a power of 10. Historically, most currencies were non-decimal, though today virtually all are nowdecimal.
Today, only two countries have non-decimal currencies:Maurit... | https://en.wikipedia.org/wiki/Non-decimal_currencies |
Incomputing,decimal32is adecimal floating-pointcomputer numbering formatthat occupies 4 bytes (32 bits) in computer memory.
Like thebinary16andbinary32formats, decimal32 uses less space than the actually most common format binary64.
decimal32 supports'normal' values, which can have 7 digit precision from±1.000000×10^... | https://en.wikipedia.org/wiki/Decimal32_floating-point_format |
Incomputing,decimal64is adecimal floating-pointcomputer number formatthat occupies 8 bytes (64 bits) in computer memory.
Decimal64 is a decimal floating-point format, formally introduced in the2008 revision[1]of theIEEE 754standard, also known as ISO/IEC/IEEE 60559:2011.[2]
Decimal64 supports 'normal' values that can... | https://en.wikipedia.org/wiki/Decimal64_floating-point_format |
Incomputing,decimal128is adecimal floating-pointnumber formatthat occupies 128 bits inmemory. Formally introduced inIEEE 754-2008,[1]it is intended for applications where it is necessary to emulate decimal rounding exactly, such as financial and tax computations.[2]
The decimal128 format supports 34decimal digitsofsig... | https://en.wikipedia.org/wiki/Decimal128_floating-point_format |
RADIX 50[1][2][3]orRAD50[3](also referred to asRADIX50,[4]RADIX-50[5]orRAD-50), is an uppercase-onlycharacter encodingcreated byDigital Equipment Corporation(DEC) for use on theirDECsystem,PDP, andVAXcomputers.
RADIX 50's 40-character repertoire (050 inoctal) can encode six characters plus four additional bits into on... | https://en.wikipedia.org/wiki/DEC_RADIX_50 |
RADIX 50[1][2][3]orRAD50[3](also referred to asRADIX50,[4]RADIX-50[5]orRAD-50), is an uppercase-onlycharacter encodingcreated byDigital Equipment Corporation(DEC) for use on theirDECsystem,PDP, andVAXcomputers.
RADIX 50's 40-character repertoire (050 inoctal) can encode six characters plus four additional bits into on... | https://en.wikipedia.org/wiki/DEC_MOD40 |
SQUOZE(abbreviated asSQZ) is a memory-efficient representation of a combinedsourceandrelocatableobjectprogram file with asymbol tableonpunched cardswhich was introduced in 1958 with theSCAT assembler[1][2]on theSHARE Operating System(SOS) for theIBM 709.[3][4]A program in this format was called aSQUOZEdeck.[5][6][7]It ... | https://en.wikipedia.org/wiki/IBM_SQUOZE |
Avigesimal(/vɪˈdʒɛsɪməl/vij-ESS-im-əl) orbase-20(base-score) numeral system is based ontwenty(in the same way in which thedecimal numeral systemis based onten).Vigesimalis derived from the Latin adjectivevicesimus, meaning 'twentieth'.
In a vigesimalplacesystem, twenty individual numerals (or digit symbols) are used, ... | https://en.wikipedia.org/wiki/Vigesimal |
Sexagesimal, also known asbase 60,[1]is anumeral systemwithsixtyas itsbase. It originated with the ancientSumeriansin the 3rd millennium BC, was passed down to the ancientBabylonians, and is still used—in a modified form—for measuringtime,angles, andgeographic coordinates.
The number 60, asuperior highly composite num... | https://en.wikipedia.org/wiki/Sexagesimal |
Abinary prefixis aunit prefixthat indicates amultipleof aunit of measurementby an integerpower of two. The most commonly used binary prefixes arekibi(symbol Ki, meaning210= 1024),mebi(Mi, 220=1048576), andgibi(Gi, 230=1073741824). They are most often used ininformation technologyas multipliers ofbitandbyte, when expres... | https://en.wikipedia.org/wiki/Binary_prefix |
CJK Compatibilityis aUnicode blockcontaining square symbols (both CJK and Latin alphanumeric) encoded for compatibility with East Asian character sets. In Unicode 1.0, it was divided into two blocks, namedCJK Squared Words(U+3300–U+337F) andCJK Squared Abbreviations(U+3380–U+33FF).[3]The square forms can have different... | https://en.wikipedia.org/wiki/CJK_Compatibility |
TheE seriesis a system ofpreferred numbers(also called preferred values) derived for use inelectronic components. It consists of theE3,E6,E12,E24,E48,E96andE192series,[1]where the number after the 'E' designates the quantity oflogarithmicvalue "steps" perdecade. Although it is theoretically possible to produce componen... | https://en.wikipedia.org/wiki/E1_series_(preferred_numbers) |
Engineering notationorengineering form(alsotechnical notation) is a version ofscientific notationin which the exponent of ten is always selected to be divisible by three to match the common metric prefixes, i.e. scientific notation that aligns with powers of a thousand, for example, 531×103instead of 5.31×105(but on ca... | https://en.wikipedia.org/wiki/Engineering_notation |
TheIndian numbering systemis used inIndia,Pakistan,Nepal,Sri Lanka, andBangladeshto express large numbers, which differs from theInternational System of Units. Commonly used quantities includelakh(one hundred thousand) andcrore(ten million) – written as 100,000 and 10,000,000 respectively in somelocales.[1]For example:... | https://en.wikipedia.org/wiki/Indian_numbering_system |
TheJoint Committee for Guides in Metrology(JCGM) is an organization inSèvresthat prepared theGuide to the Expression of Uncertainty in Measurement(GUM) and theInternational Vocabulary of Metrology(VIM). The JCGM assumed responsibility for these two documents from theISOTechnical Advisory Group 4 (TAG4).
Partner organi... | https://en.wikipedia.org/wiki/International_vocabulary_of_metrology |
ISO/IEC 80000,Quantities and units, is aninternational standarddescribing theInternational System of Quantities(ISQ). It was developed and promulgated jointly by theInternational Organization for Standardization(ISO) and theInternational Electrotechnical Commission(IEC). It serves as a style guide for usingphysical qua... | https://en.wikipedia.org/wiki/ISO/IEC_80000 |
Numeralornumber prefixesareprefixesderived fromnumeralsor occasionally othernumbers. In English and many other languages, they are used to coin numerous series of words. For example:
In many European languages there are two principal systems, taken fromLatinandGreek, each with several subsystems; in addition,Sanskrito... | https://en.wikipedia.org/wiki/Numeral_prefix |
In aratio scalebased onpowers of ten, theorder of magnitudeis a measure of the nearness of two figures. Two numbers are "within an order of magnitude" of each other if their ratio is between 1/10 and 10. In other words, the two numbers are within about a factor of 10 of each other.[1]
For example, 1 and 1.02 are withi... | https://en.wikipedia.org/wiki/Order_of_magnitude |
Theorder of magnitudeof data may be specified in strictly standards-conformantunits of informationand multiples of thebitandbytewith decimal scaling, or using historically common usages of a few multiplier prefixes in a binary interpretation which has been common incomputinguntil new binary prefixes were defined in the... | https://en.wikipedia.org/wiki/Orders_of_magnitude_(data) |
TheUnified Code for Units of Measure(UCUM) is a system of codes for unambiguously representing measurement units. Its primary purpose is machine-to-machine communication rather than communication between humans.[1]UCUM is used by different organizations likeIEEE, and standards likeDICOM,LOINC,HL7, andISO 11240:2012.[2]... | https://en.wikipedia.org/wiki/Unified_Code_for_Units_of_Measure |
TheSuzhou numerals, also known asSūzhōu mǎzi(蘇州碼子), is anumeral systemused in China before the introduction ofHindu numerals. The Suzhou numerals are also known asSoochow numerals,[1]ma‑tzu,[2]huāmǎ(花碼),[3][better source needed]cǎomǎ(草碼),[3][better source needed]jīngzǐmǎ(菁仔碼),[3][better source needed]fānzǐmǎ(番仔碼)[3][be... | https://en.wikipedia.org/wiki/Suzhou_numerals |
Incomputer architecture,bit-serial architecturessend data one bit at a time, along a single wire, in contrast tobit-parallelwordarchitectures, in which data values are sent all bits or a word at once along a group of wires.
All digital computers built before 1951, and most of the earlymassive parallel processingmachin... | https://en.wikipedia.org/wiki/Bit-serial_architecture |
Aserial computeris a computer typified bybit-serial architecture– i.e., internally operating on onebitordigitfor eachclock cycle. Machines with serialmain storagedevices such as acoustic ormagnetostrictivedelay linesandrotating magnetic deviceswere usually serial computers.
Serial computers require much less hardware... | https://en.wikipedia.org/wiki/Digit-serial_architecture |
Indigital circuitsandmachine learning, aone-hotis a group ofbitsamong which the legal combinations of values are only those with a single high (1) bit and all the others low (0).[1]A similar implementation in which all bits are '1' except one '0' is sometimes calledone-cold.[2]Instatistics,dummy variablesrepresent a si... | https://en.wikipedia.org/wiki/1-of-10_code |
Indigital circuitsandmachine learning, aone-hotis a group ofbitsamong which the legal combinations of values are only those with a single high (1) bit and all the others low (0).[1]A similar implementation in which all bits are '1' except one '0' is sometimes calledone-cold.[2]Instatistics,dummy variablesrepresent a si... | https://en.wikipedia.org/wiki/One-hot_code |
Anumeral systemis a writing system for expressingnumbers; that is, amathematical notationfor representing numbers of a given set, usingdigitsor other symbols in a consistent manner.
The same sequence of symbols may represent different numbers in different numeral systems. For example, "11" represents the numbereleveni... | https://en.wikipedia.org/wiki/Numeral_system |
Backward inductionis the process of determining asequenceof optimal choices by reasoning from the endpoint of a problem or situation back to its beginning using individual events or actions.[1]Backward induction involves examining the final point in a series of decisions and identifying the optimal process or action re... | https://en.wikipedia.org/wiki/Backward_induction |
Incombinatorial game theory,cooling,heating, andoverheatingare operations onhot gamesto make them more amenable to the traditional methods of the theory,
which was originally devised forcold gamesin which the winner is the last player to have a legal move.[1]Overheatingwas generalised byElwyn Berlekampfor the analysis ... | https://en.wikipedia.org/wiki/Cooling_and_heating_(combinatorial_game_theory) |
Aconnection gameis a type ofabstract strategy gamein which players attempt to complete a specific type of connection with their pieces. This could involve forming a path between two or more endpoints, completing a closed loop, or connecting all of one's pieces so they are adjacent to each other.[1]Connection games typi... | https://en.wikipedia.org/wiki/Connection_game |
Inchess, theendgame tablebase, or simply thetablebase, is a computeriseddatabasecontaining precalculated evaluations ofendgamepositions. Tablebases are used to analyse finished games, as well as bychess enginesto evaluate positions during play. Tablebases are typically exhaustive, covering every legal arrangement of a ... | https://en.wikipedia.org/wiki/Endgame_tablebase |
Theexpectiminimaxalgorithm is a variation of theminimaxalgorithm, for use inartificial intelligencesystems that play two-playerzero-sum games, such asbackgammon, in which the outcome depends on a combination of the player's skill andchance elementssuch as dice rolls. In addition to "min" and "max" nodes of the traditio... | https://en.wikipedia.org/wiki/Expectiminimax_tree |
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