source stringlengths 31 203 | text stringlengths 28 2k |
|---|---|
https://en.wikipedia.org/wiki/Object%20file | An object file is a computer file containing object code, that is, machine code output of an assembler or compiler. The object code is usually relocatable, and not usually directly executable. There are various formats for object files, and the same machine code can be packaged in different object file formats. An obje... |
https://en.wikipedia.org/wiki/Safety%20data%20sheet | A safety data sheet (SDS), material safety data sheet (MSDS), or product safety data sheet (PSDS) is a document that lists information relating to occupational safety and health for the use of various substances and products. SDSs are a widely used system for cataloguing information on chemicals, chemical compounds, a... |
https://en.wikipedia.org/wiki/Domain%20Name%20System%20Security%20Extensions | The Domain Name System Security Extensions (DNSSEC) are a suite of extension specifications by the Internet Engineering Task Force (IETF) for securing data exchanged in the Domain Name System (DNS) in Internet Protocol (IP) networks. The protocol provides cryptographic authentication of data, authenticated denial of ex... |
https://en.wikipedia.org/wiki/Raoul%20Bott | Raoul Bott (September 24, 1923 – December 20, 2005) was a Hungarian-American mathematician known for numerous foundational contributions to geometry in its broad sense. He is best known for his Bott periodicity theorem, the Morse–Bott functions which he used in this context, and the Borel–Bott–Weil theorem.
Early life... |
https://en.wikipedia.org/wiki/Composite%20data%20type | In computer science, a composite data type or compound data type is any data type which can be constructed in a program using the programming language's primitive data types and other composite types. It is sometimes called a structure or aggregate type, although the latter term may also refer to arrays, lists, etc. ... |
https://en.wikipedia.org/wiki/BurgerTime | originally released as in Japan, is a 1982 arcade video game developed by Data East, initially for its DECO Cassette System. The player is chef Peter Pepper, who must walk over hamburger ingredients in a maze of platforms and ladders while avoiding anthropomorphic hot dogs, fried eggs, and pickles which are in pursuit... |
https://en.wikipedia.org/wiki/Table%20%28information%29 | A table is an arrangement of information or data, typically in rows and columns, or possibly in a more complex structure. Tables are widely used in communication, research, and data analysis. Tables appear in print media, handwritten notes, computer software, architectural ornamentation, traffic signs, and many other p... |
https://en.wikipedia.org/wiki/List%20of%20calculus%20topics | This is a list of calculus topics.
Limits
Limit (mathematics)
Limit of a function
One-sided limit
Limit of a sequence
Indeterminate form
Orders of approximation
(ε, δ)-definition of limit
Continuous function
Differential calculus
Derivative
Notation
Newton's notation for differentiation
Leibniz's notation... |
https://en.wikipedia.org/wiki/Dihedral%20angle | A dihedral angle is the angle between two intersecting planes or half-planes. In chemistry, it is the clockwise angle between half-planes through two sets of three atoms, having two atoms in common. In solid geometry, it is defined as the union of a line and two half-planes that have this line as a common edge. In hig... |
https://en.wikipedia.org/wiki/Plateau%27s%20problem | In mathematics, Plateau's problem is to show the existence of a minimal surface with a given boundary, a problem raised by Joseph-Louis Lagrange in 1760. However, it is named after Joseph Plateau who experimented with soap films. The problem is considered part of the calculus of variations. The existence and regulari... |
https://en.wikipedia.org/wiki/Hasse%20diagram | In order theory, a Hasse diagram (; ) is a type of mathematical diagram used to represent a finite partially ordered set, in the form of a drawing of its transitive reduction. Concretely, for a partially ordered set one represents each element of as a vertex in the plane and draws a line segment or curve that goes up... |
https://en.wikipedia.org/wiki/Value%20%28computer%20science%29 | In computer science and software programming, a value is the representation of some entity that can be manipulated by a program. The members of a type are the values of that type.
The "value of a variable" is given by the corresponding mapping in the environment. In languages with assignable variables, it becomes nec... |
https://en.wikipedia.org/wiki/Long%20line%20%28topology%29 | In topology, the long line (or Alexandroff line) is a topological space somewhat similar to the real line, but in a certain way "longer". It behaves locally just like the real line, but has different large-scale properties (e.g., it is neither Lindelöf nor separable). Therefore, it serves as an important counterexampl... |
https://en.wikipedia.org/wiki/Humoral%20immunity | Humoral immunity is the aspect of immunity that is mediated by macromolecules - including secreted antibodies, complement proteins, and certain antimicrobial peptides - located in extracellular fluids. Humoral immunity is named so because it involves substances found in the humors, or body fluids. It contrasts with cel... |
https://en.wikipedia.org/wiki/Radon%E2%80%93Nikodym%20theorem | In mathematics, the Radon–Nikodym theorem is a result in measure theory that expresses the relationship between two measures defined on the same measurable space. A measure is a set function that assigns a consistent magnitude to the measurable subsets of a measurable space. Examples of a measure include area and volum... |
https://en.wikipedia.org/wiki/Back-side%20bus | In personal computer microprocessor architecture, a back-side bus (BSB), or backside bus, was a computer bus used on early Intel platforms to connect the CPU to CPU cache memory, usually off-die L2. If a design utilizes it along with a front-side bus (FSB), it is said to use a dual-bus architecture, or in Intel's termi... |
https://en.wikipedia.org/wiki/Exponential%20family | In probability and statistics, an exponential family is a parametric set of probability distributions of a certain form, specified below. This special form is chosen for mathematical convenience, including the enabling of the user to calculate expectations, covariances using differentiation based on some useful algebra... |
https://en.wikipedia.org/wiki/Points%20of%20the%20compass | The points of the compass are a set of horizontal, radially arrayed compass directions (or azimuths) used in navigation and cartography. A compass rose is primarily composed of four cardinal directions—north, east, south, and west—each separated by 90 degrees, and secondarily divided by four ordinal (intercardinal) dir... |
https://en.wikipedia.org/wiki/List%20of%20real%20analysis%20topics | This is a list of articles that are considered real analysis topics.
General topics
Limits
Limit of a sequence
Subsequential limit – the limit of some subsequence
Limit of a function (see List of limits for a list of limits of common functions)
One-sided limit – either of the two limits of functions of real variable... |
https://en.wikipedia.org/wiki/Cloning%20vector | A cloning vector is a small piece of DNA that can be stably maintained in an organism, and into which a foreign DNA fragment can be inserted for cloning purposes. The cloning vector may be DNA taken from a virus, the cell of a higher organism, or it may be the plasmid of a bacterium. The vector contains features that a... |
https://en.wikipedia.org/wiki/Semiprime | In mathematics, a semiprime is a natural number that is the product of exactly two prime numbers. The two primes in the product may equal each other, so the semiprimes include the squares of prime numbers.
Because there are infinitely many prime numbers, there are also infinitely many semiprimes. Semiprimes are also ca... |
https://en.wikipedia.org/wiki/Almost%20prime | In number theory, a natural number is called k-almost prime if it has k prime factors. More formally, a number n is k-almost prime if and only if Ω(n) = k, where Ω(n) is the total number of primes in the prime factorization of n (can be also seen as the sum of all the primes' exponents):
A natural number is thus prime... |
https://en.wikipedia.org/wiki/Frozen%20food | Freezing food preserves it from the time it is prepared to the time it is eaten. Since early times, farmers, fishermen, and trappers have preserved grains and produce in unheated buildings during the winter season. Freezing food slows decomposition by turning residual moisture into ice, inhibiting the growth of most ba... |
https://en.wikipedia.org/wiki/Vaccinia | Vaccinia virus (VACV or VV) is a large, complex, enveloped virus belonging to the poxvirus family. It has a linear, double-stranded DNA genome approximately 190 kbp in length, which encodes approximately 250 genes. The dimensions of the virion are roughly 360 × 270 × 250 nm, with a mass of approximately 5–10 fg. The va... |
https://en.wikipedia.org/wiki/Myhill%E2%80%93Nerode%20theorem | In the theory of formal languages, the Myhill–Nerode theorem provides a necessary and sufficient condition for a language to be regular. The theorem is named for John Myhill and Anil Nerode, who proved it at the University of Chicago in 1957 .
Statement
Given a language , and a pair of strings and , define a disting... |
https://en.wikipedia.org/wiki/Bernstein%20polynomial | In the mathematical field of numerical analysis, a Bernstein polynomial is a polynomial expressed as a linear combination of Bernstein basis polynomials. The idea is named after mathematician Sergei Natanovich Bernstein.
Polynomials in Bernstein form were first used by Bernstein in a constructive proof for the Weierst... |
https://en.wikipedia.org/wiki/Pointwise%20convergence | In mathematics, pointwise convergence is one of various senses in which a sequence of functions can converge to a particular function. It is weaker than uniform convergence, to which it is often compared.
Definition
Suppose that is a set and is a topological space, such as the real or complex numbers or a metric sp... |
https://en.wikipedia.org/wiki/Partition%20of%20a%20set | In mathematics, a partition of a set is a grouping of its elements into non-empty subsets, in such a way that every element is included in exactly one subset.
Every equivalence relation on a set defines a partition of this set, and every partition defines an equivalence relation. A set equipped with an equivalence rel... |
https://en.wikipedia.org/wiki/Pentagonal%20number%20theorem | In mathematics, Euler's pentagonal number theorem relates the product and series representations of the Euler function. It states that
In other words,
The exponents 1, 2, 5, 7, 12, ... on the right hand side are given by the formula for k = 1, −1, 2, −2, 3, ... and are called (generalized) pentagonal numbers . (The... |
https://en.wikipedia.org/wiki/Sodium%20stearoyl%20lactylate | Sodium stearoyl-2-lactylate (sodium stearoyl lactylate or SSL) is a versatile, FDA approved food additive used to improve the mix tolerance and volume of processed foods. It is one type of a commercially available lactylate. SSL is non-toxic, biodegradable, and typically manufactured using biorenewable feedstocks. Be... |
https://en.wikipedia.org/wiki/Economic%20statistics | Economic statistics is a topic in applied statistics and applied economics that concerns the collection, processing, compilation, dissemination, and analysis of economic data. It is closely related to business statistics and econometrics. It is also common to call the data themselves "economic statistics", but for this... |
https://en.wikipedia.org/wiki/Freemartin | A freemartin or free-martin (sometimes martin heifer) is an infertile female cattle with masculinized behavior and non-functioning ovaries. Phenotypically, the animal appears female, but various aspects of female reproductive development are altered due to acquisition of anti-Müllerian hormone from the male twin. Genet... |
https://en.wikipedia.org/wiki/Marcian%20Hoff | Marcian Edward "Ted" Hoff Jr. (born October 28, 1937, in Rochester, New York) is one of the inventors of the microprocessor.
Education and work history
Hoff received a bachelor's degree in electrical engineering from the Rensselaer Polytechnic Institute in 1958. He applied for his first two patents based on work done ... |
https://en.wikipedia.org/wiki/Serial%20Peripheral%20Interface | Serial Peripheral Interface (SPI) is a de facto standard (with many variants) for synchronous serial communication, used primarily in embedded systems for short-distance wired communication between integrated circuits.
SPI uses a main–subnode (master/slave) architecture, where one main device orchestrates communicatio... |
https://en.wikipedia.org/wiki/Display%20Data%20Channel | The Display Data Channel, or DDC, is a collection of protocols for digital communication between a computer display and a graphics adapter that enable the display to communicate its supported display modes to the adapter and that enable the computer host to adjust monitor parameters, such as brightness and contrast.
L... |
https://en.wikipedia.org/wiki/Prodigy%20%28online%20service%29 | Prodigy Communications Corporation was an online service from 1984 to 2001 that offered its subscribers access to a broad range of networked services. It was one of the major internet service providers of the 1990s.
The company claimed it was the first consumer online service, citing its graphical user interface and ... |
https://en.wikipedia.org/wiki/Nilometer | A nilometer was a structure for measuring the Nile River's clarity and water level during the annual flood season. There were three main types of nilometers, calibrated in Egyptian cubits: (1) a vertical column, (2) a corridor stairway of steps leading down to the Nile, or (3) a deep well with culvert. If the water lev... |
https://en.wikipedia.org/wiki/List%20of%20complex%20analysis%20topics | Complex analysis, traditionally known as the theory of functions of a complex variable, is the branch of mathematics that investigates functions of complex numbers. It is useful in many branches of mathematics, including number theory and applied mathematics; as well as in physics, including hydrodynamics, thermodynami... |
https://en.wikipedia.org/wiki/George%20Boolos | George Stephen Boolos (; 4 September 1940 – 27 May 1996) was an American philosopher and a mathematical logician who taught at the Massachusetts Institute of Technology.
Life
Boolos was of Greek-Jewish descent. He graduated with an A.B. in mathematics from Princeton University after completing a senior thesis, titled... |
https://en.wikipedia.org/wiki/Function%20space | In mathematics, a function space is a set of functions between two fixed sets. Often, the domain and/or codomain will have additional structure which is inherited by the function space. For example, the set of functions from any set into a vector space has a natural vector space structure given by pointwise addition a... |
https://en.wikipedia.org/wiki/Internal%20energy | The internal energy of a thermodynamic system is the energy contained within it, measured as the quantity of energy necessary to bring the system from its standard internal state to its present internal state of interest, accounting for the gains and losses of energy due to changes in its internal state, including suc... |
https://en.wikipedia.org/wiki/Arlington%20Hall | Arlington Hall (also called Arlington Hall Station) is a historic building in Arlington, Virginia, originally a girls' school and later the headquarters of the United States Army's Signal Intelligence Service (SIS) cryptography effort during World War II. The site presently houses the George P. Shultz National Foreign ... |
https://en.wikipedia.org/wiki/Sparse%20matrix | In numerical analysis and scientific computing, a sparse matrix or sparse array is a matrix in which most of the elements are zero. There is no strict definition regarding the proportion of zero-value elements for a matrix to qualify as sparse but a common criterion is that the number of non-zero elements is roughly eq... |
https://en.wikipedia.org/wiki/Reporter%20gene | In molecular biology, a reporter gene (often simply reporter) is a gene that researchers attach to a regulatory sequence of another gene of interest in bacteria, cell culture, animals or plants. Such genes are called reporters because the characteristics they confer on organisms expressing them are easily identified an... |
https://en.wikipedia.org/wiki/List%20of%20functional%20analysis%20topics | This is a list of functional analysis topics.
See also: Glossary of functional analysis.
Hilbert space
Functional analysis, classic results
Operator theory
Banach space examples
Lp space
Hardy space
Sobolev space
Tsirelson space
ba space
Real and complex algebras
Topological vector spaces
Amenability
Amenable... |
https://en.wikipedia.org/wiki/Matrix%20similarity | In linear algebra, two n-by-n matrices and are called similar if there exists an invertible n-by-n matrix such that
Similar matrices represent the same linear map under two (possibly) different bases, with being the change of basis matrix.
A transformation is called a similarity transformation or conjugation of ... |
https://en.wikipedia.org/wiki/The%20Analyst | The Analyst (subtitled A Discourse Addressed to an Infidel Mathematician: Wherein It Is Examined Whether the Object, Principles, and Inferences of the Modern Analysis Are More Distinctly Conceived, or More Evidently Deduced, Than Religious Mysteries and Points of Faith) is a book by George Berkeley. It was first publi... |
https://en.wikipedia.org/wiki/Straw-bale%20construction | Straw-bale construction is a building method that uses bales of straw (commonly wheat, rice, rye and oats straw) as structural elements, building insulation, or both. This construction method is commonly used in natural building or "brown" construction projects. Research has shown that straw-bale construction is a sust... |
https://en.wikipedia.org/wiki/Damk%C3%B6hler%20numbers | The Damköhler numbers (Da) are dimensionless numbers used in chemical engineering to relate the chemical reaction timescale (reaction rate) to the transport phenomena rate occurring in a system. It is named after German chemist Gerhard Damköhler.
The Karlovitz number (Ka) is related to the Damköhler number by Da = 1/K... |
https://en.wikipedia.org/wiki/Standard%20enthalpy%20of%20reaction | The standard enthalpy of reaction (denoted ) for a chemical reaction is the difference between total product and total reactant molar enthalpies, calculated for substances in their standard states. The value can be approximately interpreted in terms of the total of the chemical bond energies for bonds broken and bonds ... |
https://en.wikipedia.org/wiki/Cantor%27s%20theorem | In mathematical set theory, Cantor's theorem is a fundamental result which states that, for any set , the set of all subsets of the power set of has a strictly greater cardinality than itself.
For finite sets, Cantor's theorem can be seen to be true by simple enumeration of the number of subsets. Counting the empt... |
https://en.wikipedia.org/wiki/L%C3%B6wenheim%E2%80%93Skolem%20theorem | In mathematical logic, the Löwenheim–Skolem theorem is a theorem on the existence and cardinality of models, named after Leopold Löwenheim and Thoralf Skolem.
The precise formulation is given below. It implies that if a countable first-order theory has an infinite model, then for every infinite cardinal number κ it ha... |
https://en.wikipedia.org/wiki/30%20%28number%29 | 30 (thirty) is the natural number following 29 and preceding 31.
In mathematics
30 is an even, composite, pronic number. With 2, 3, and 5 as its prime factors, it is a regular number and the first sphenic number, the smallest of the form , where is a prime greater than 3. It has an aliquot sum of 42, which is the se... |
https://en.wikipedia.org/wiki/40%20%28number%29 | 40 (forty) is the natural number following 39 and preceding 41.
Though the word is related to four (4), the spelling forty replaced fourty during the 17th century and is now the standard form.
In mathematics
Forty is the fourth octagonal number. As the sum of the first four pentagonal numbers: , it is also the fourt... |
https://en.wikipedia.org/wiki/Square%20root%20of%202 | The square root of 2 (approximately 1.4142) is a positive real number that, when multiplied by itself, equals the number 2. It may be written in mathematics as or . It is an algebraic number, and therefore not a transcendental number. Technically, it should be called the principal square root of 2, to distinguish it f... |
https://en.wikipedia.org/wiki/List%20of%20Lie%20groups%20topics | This is a list of Lie group topics, by Wikipedia page.
Examples
See Table of Lie groups for a list
General linear group, special linear group
SL2(R)
SL2(C)
Unitary group, special unitary group
SU(2)
SU(3)
Orthogonal group, special orthogonal group
Rotation group SO(3)
SO(8)
Generalized orthogonal group, generalized s... |
https://en.wikipedia.org/wiki/List%20of%20gene%20families | This is a list of gene families or gene complexes, i.e. sets of genes which are related ancestrally and often serve similar biological functions. These gene families typically encode functionally related proteins, and sometimes the term gene families is a shorthand for the sets of proteins that the genes encode. They m... |
https://en.wikipedia.org/wiki/Yamaha%20YM2612 | The YM2612, a.k.a. OPN2, is a sound chip developed by Yamaha. It is a member of Yamaha's OPN family of FM synthesis chips, and is derived from the YM2203.
The YM2612 is a six-channel FM synthesizer. It was used in several game and computer systems, most notably in Sega's Mega Drive/Genesis video game console as well a... |
https://en.wikipedia.org/wiki/Center%20%28algebra%29 | The term center or centre is used in various contexts in abstract algebra to denote the set of all those elements that commute with all other elements.
The center of a group G consists of all those elements x in G such that xg = gx for all g in G. This is a normal subgroup of G.
The similarly named notion for a semig... |
https://en.wikipedia.org/wiki/Fuel%20efficiency | Fuel efficiency is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work. Overall fuel efficiency may vary per device, which in turn may vary per application, and this spectrum of variance is oft... |
https://en.wikipedia.org/wiki/Touchard%20polynomials | The Touchard polynomials, studied by , also called the exponential polynomials or Bell polynomials, comprise a polynomial sequence of binomial type defined by
where is a Stirling number of the second kind, i.e., the number of partitions of a set of size n into k disjoint non-empty subsets.
The first few Touchard poly... |
https://en.wikipedia.org/wiki/Inclusion%E2%80%93exclusion%20principle | In combinatorics, a branch of mathematics, the inclusion–exclusion principle is a counting technique which generalizes the familiar method of obtaining the number of elements in the union of two finite sets; symbolically expressed as
where A and B are two finite sets and |S | indicates the cardinality of a set S (whic... |
https://en.wikipedia.org/wiki/Toyota%20Production%20System | The Toyota Production System (TPS) is an integrated socio-technical system, developed by Toyota, that comprises its management philosophy and practices. The TPS is a management system that organizes manufacturing and logistics for the automobile manufacturer, including interaction with suppliers and customers. The syst... |
https://en.wikipedia.org/wiki/Corning%20Inc. | Corning Incorporated () is an American multinational technology company that specializes in specialty glass, ceramics, and related materials and technologies including advanced optics, primarily for industrial and scientific applications. The company was named Corning Glass Works until 1989. Corning divested its consum... |
https://en.wikipedia.org/wiki/Bilayer | A bilayer is a double layer of closely packed atoms or molecules.
The properties of bilayers are often studied in condensed matter physics, particularly in the context of semiconductor devices, where two distinct materials are united to form junctions, such as p–n junctions, Schottky junctions, etc. Layered materials,... |
https://en.wikipedia.org/wiki/Image%20%28category%20theory%29 | In category theory, a branch of mathematics, the image of a morphism is a generalization of the image of a function.
General definition
Given a category and a morphism in , the image
of is a monomorphism satisfying the following universal property:
There exists a morphism such that .
For any object with a mor... |
https://en.wikipedia.org/wiki/Friedmann%E2%80%93Lema%C3%AEtre%E2%80%93Robertson%E2%80%93Walker%20metric | The Friedmann–Lemaître–Robertson–Walker metric (FLRW; ) is a metric based on the exact solution of the Einstein field equations of general relativity. The metric describes a homogeneous, isotropic, expanding (or otherwise, contracting) universe that is path-connected, but not necessarily simply connected. The general f... |
https://en.wikipedia.org/wiki/Cousin%20prime | In number theory, cousin primes are prime numbers that differ by four. Compare this with twin primes, pairs of prime numbers that differ by two, and sexy primes, pairs of prime numbers that differ by six.
The cousin primes (sequences and in OEIS) below 1000 are:
(3, 7), (7, 11), (13, 17), (19, 23), (37, 41), (43, ... |
https://en.wikipedia.org/wiki/Schnirelmann%20density | In additive number theory, the Schnirelmann density of a sequence of numbers is a way to measure how "dense" the sequence is. It is named after Russian mathematician Lev Schnirelmann, who was the first to study it.
Definition
The Schnirelmann density of a set of natural numbers A is defined as
where A(n) denotes the ... |
https://en.wikipedia.org/wiki/Internet2 | Internet2 is a not-for-profit United States computer networking consortium led by members from the research and education communities, industry, and government. The Internet2 consortium administrative headquarters are located in Ann Arbor, Michigan, with offices in Washington, D.C., and Emeryville, California.
As of N... |
https://en.wikipedia.org/wiki/Hartley%20oscillator | The Hartley oscillator is an electronic oscillator circuit in which the oscillation frequency is determined by a tuned circuit consisting of capacitors and inductors, that is, an LC oscillator. The circuit was invented in 1915 by American engineer Ralph Hartley. The distinguishing feature of the Hartley oscillator is ... |
https://en.wikipedia.org/wiki/Regenerative%20circuit | A regenerative circuit is an amplifier circuit that employs positive feedback (also known as regeneration or reaction). Some of the output of the amplifying device is applied back to its input to add to the input signal, increasing the amplification. One example is the Schmitt trigger (which is also known as a regenera... |
https://en.wikipedia.org/wiki/Toffoli%20gate | In logic circuits, the Toffoli gate (also CCNOT gate), invented by Tommaso Toffoli, is a universal reversible logic gate, which means that any classical reversible circuit can be constructed from Toffoli gates. It is also known as the "controlled-controlled-not" gate, which describes its action. It has 3-bit inputs and... |
https://en.wikipedia.org/wiki/60%20%28number%29 | 60 (sixty) () is the natural number following 59 and preceding 61. Being three times 20, it is called threescore in older literature (kopa in Slavic, Schock in Germanic).
In mathematics
60 is a highly composite number. Because it is the sum of its unitary divisors (excluding itself), it is a unitary perfect number, a... |
https://en.wikipedia.org/wiki/70%20%28number%29 | 70 (seventy) is the natural number following 69 and preceding 71.
In mathematics
70 is:
a sphenic number because its factors are 3 distinct primes.
a Pell number.
the seventh pentagonal number.
the fourth tridecagonal number.
the fifth pentatope number.
the number of ways to choose 4 objects out of 8 if order d... |
https://en.wikipedia.org/wiki/80%20%28number%29 | 80 (eighty) is the natural number following 79 and preceding 81.
In mathematics
80 is:
the sum of Euler's totient function φ(x) over the first sixteen integers.
a semiperfect number, since adding up some subsets of its divisors (e.g., 1, 4, 5, 10, 20 and 40) gives 80.
a ménage number.
palindromic in bases 3 (222... |
https://en.wikipedia.org/wiki/90%20%28number%29 | 90 (ninety) is the natural number following 89 and preceding 91.
In the English language, the numbers 90 and 19 are often confused, as they sound very similar. When carefully enunciated, they differ in which syllable is stressed: 19 /naɪnˈtiːn/ vs 90 /ˈnaɪnti/. However, in dates such as 1999, and when contrasting numb... |
https://en.wikipedia.org/wiki/Simple%20theorems%20in%20the%20algebra%20of%20sets | The simple theorems in the algebra of sets are some of the elementary properties of the algebra of union (infix operator: ∪), intersection (infix operator: ∩), and set complement (postfix ') of sets.
These properties assume the existence of at least two sets: a given universal set, denoted U, and the empty set, denote... |
https://en.wikipedia.org/wiki/Maternal%20effect | A maternal effect is a situation where the phenotype of an organism is determined not only by the environment it experiences and its genotype, but also by the environment and genotype of its mother. In genetics, maternal effects occur when an organism shows the phenotype expected from the genotype of the mother, irresp... |
https://en.wikipedia.org/wiki/Wear%20leveling | Wear leveling (also written as wear levelling) is a technique for prolonging the service life of some kinds of erasable computer storage media, such as flash memory, which is used in solid-state drives (SSDs) and USB flash drives, and phase-change memory. There are several wear leveling mechanisms that provide varying ... |
https://en.wikipedia.org/wiki/Set-theoretic%20limit | In mathematics, the limit of a sequence of sets (subsets of a common set ) is a set whose elements are determined by the sequence in either of two equivalent ways: (1) by upper and lower bounds on the sequence that converge monotonically to the same set (analogous to convergence of real-valued sequences) and (2) by co... |
https://en.wikipedia.org/wiki/Signal%20trace | In electronics, a signal trace or circuit trace on a printed circuit board (PCB) or integrated circuit (IC) is the equivalent of a wire for conducting signals. Each trace consists of a flat, narrow part of the copper foil that remains after etching. Signal traces are usually narrower than power or ground traces because... |
https://en.wikipedia.org/wiki/Electrical%20termination | In electronics, electrical termination is the practice of ending a transmission line with a device that matches the characteristic impedance of the line. Termination prevents signals from reflecting off the end of the transmission line. Reflections at the ends of unterminated transmission lines cause distortion, which ... |
https://en.wikipedia.org/wiki/Audio%20frequency | An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch.
The generally accepted standard hearing range for humans is 20 to 20,000 Hz. In air at atmospheric pr... |
https://en.wikipedia.org/wiki/Living%20fossil | A living fossil is an extant taxon that cosmetically resembles related species known only from the fossil record. To be considered a living fossil, the fossil species must be old relative to the time of origin of the extant clade. Living fossils commonly are of species-poor lineages, but they need not be. While the bod... |
https://en.wikipedia.org/wiki/World%20Solar%20Challenge | The World Solar Challenge (WSC), since 2013 named Bridgestone World Solar Challenge, is an international event for solar powered cars driving 3000 kilometres through the Australian outback.
With the exception of a four-year gap between the 2019 and 2023 events, owing to the cancellation of the 2021 event, the World S... |
https://en.wikipedia.org/wiki/Multiplicative%20order | In number theory, given a positive integer n and an integer a coprime to n, the multiplicative order of a modulo n is the smallest positive integer k such that .
In other words, the multiplicative order of a modulo n is the order of a in the multiplicative group of the units in the ring of the integers modulo n.
The ... |
https://en.wikipedia.org/wiki/Analog%20multiplier | In electronics, an analog multiplier is a device that takes two analog signals and produces an output which is their product. Such circuits can be used to implement related functions such as squares (apply same signal to both inputs), and square roots.
An electronic analog multiplier can be called by several names, de... |
https://en.wikipedia.org/wiki/Rhino%20%28JavaScript%20engine%29 | Rhino is a JavaScript engine written fully in Java and managed by the Mozilla Foundation as open source software. It is separate from the SpiderMonkey engine, which is also developed by Mozilla, but written in C++ and used in Mozilla Firefox.
History
The Rhino project was started at Netscape in 1997. At the time, Net... |
https://en.wikipedia.org/wiki/Glen%20Canyon%20Dam | Glen Canyon Dam is a concrete arch-gravity dam in the southwestern United States, located on the Colorado River in northern Arizona, near the town of Page. The dam was built by the Bureau of Reclamation (USBR) from 1956 to 1966 and forms Lake Powell, one of the largest man-made reservoirs in the U.S. with a capacity o... |
https://en.wikipedia.org/wiki/New%20media | New media are communication technologies that enable or enhance interaction between users as well as interaction between users and content. In the middle of the 1990s, the phrase "new media" became widely used as part of a sales pitch for the influx of interactive CD-ROMs for entertainment and education. The new media ... |
https://en.wikipedia.org/wiki/B%C3%BCchi%20automaton | In computer science and automata theory, a deterministic Büchi automaton is a theoretical machine which either accepts or rejects infinite inputs. Such a machine has a set of states and a transition function, which determines which state the machine should move to from its current state when it reads the next input cha... |
https://en.wikipedia.org/wiki/Asymmetry | Asymmetry is the absence of, or a violation of, symmetry (the property of an object being invariant to a transformation, such as reflection). Symmetry is an important property of both physical and abstract systems and it may be displayed in precise terms or in more aesthetic terms. The absence of or violation of symmet... |
https://en.wikipedia.org/wiki/Chemosynthesis | In biochemistry, chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or ferrous ions as a source of energy, rather than sunlight, as ... |
https://en.wikipedia.org/wiki/Intuitionistic%20type%20theory | Intuitionistic type theory (also known as constructive type theory, or Martin-Löf type theory) is a type theory and an alternative foundation of mathematics.
Intuitionistic type theory was created by Per Martin-Löf, a Swedish mathematician and philosopher, who first published it in 1972. There are multiple versions of... |
https://en.wikipedia.org/wiki/Jonathan%20Schaeffer | Jonathan Herbert Schaeffer (born 1957) is a Canadian researcher and professor at the University of Alberta and the former Canada Research Chair in Artificial Intelligence.
He led the team that wrote Chinook, the world's strongest American checkers player, after some relatively good results in writing computer chess p... |
https://en.wikipedia.org/wiki/System%207 | System 7, codenamed "Big Bang", and later (as of version 7.6) also known as Mac OS 7, is a graphical user interface-based operating system for Macintosh computers and is part of the classic Mac OS series of operating systems. It was introduced on May 13, 1991, by Apple Computer It succeeded System 6, and was the main M... |
https://en.wikipedia.org/wiki/List%20of%20differential%20geometry%20topics | This is a list of differential geometry topics. See also glossary of differential and metric geometry and list of Lie group topics.
Differential geometry of curves and surfaces
Differential geometry of curves
List of curves topics
Frenet–Serret formulas
Curves in differential geometry
Line element
Curvature
Radius o... |
https://en.wikipedia.org/wiki/Texas%20Instruments%20SN76489 | The SN76489 Digital Complex Sound Generator (DCSG) is a TTL-compatible programmable sound generator chip from Texas Instruments. Its main application was the generation of music and sound effects in game consoles, arcade games and home computers (such as the TI-99/4A, BBC Micro, ColecoVision, IBM PCjr, Tomy Tutor, and ... |
https://en.wikipedia.org/wiki/Envelope%20detector | An envelope detector (sometimes called a peak detector) is an electronic circuit that takes a (relatively) high-frequency amplitude modulated signal as input and provides an output, which is the demodulated envelope of the original signal.
Circuit operation
The capacitor in the circuit above stores charge on the risin... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.