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Diameter
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle. Both definitions are also valid for the diameter of a sphere. In more modern usage, the length of a diameter is also called the diameter. In this sense one speaks of the diameter rather than a diameter (which refers to the line itself), because all diameters of a circle or sphere have the same length, this being twice the radius r. d = 2 r ⇒ r = d 2 . displaystyle d=2rquad Rightarrow quad r= frac d 2 . For a convex shape in the plane, the diameter is defined to be the largest distance that can be formed between two opposite parallel lines tangent to its boundary, and the width is often defined to be the smallest such distance
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Latex
La TeX
TeX
(/ˈlɑːtɛx/ LAH-tekh or /ˈleɪtɛx/ LAY-tekh;[1] a shortening of Lamport TeX) is a document preparation system.[2] When writing, the writer uses plain text as opposed to the formatted text found in WYSIWYG
WYSIWYG
("what you see is what you get") word processors like Microsoft Word, LibreOffice Writer
LibreOffice Writer
and Apple Pages. The writer uses markup tagging conventions to define the general structure of a document (such as article, book, and letter), to stylise text throughout a document (such as bold and italics), and to add citations and cross-references. A TeX
TeX
distribution such as TeX
TeX
Live or Mik TeX
TeX
is used to produce an output file (such as PDF
PDF
or DVI) suitable for printing or digital distribution
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Homoglyph
In orthography and typography, a homoglyph is one of two or more graphemes, characters, or glyphs with shapes that appear identical or very similar. The designation is also applied to sequences of characters sharing these properties. Synoglyphs are glyphs that look different but mean the same thing. Synoglyphs are also known informally as display variants
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Demeter
In ancient Greek religion and mythology, Demeter
Demeter
(/dɪˈmiːtər/; Attic: Δημήτηρ Dēmḗtēr, pronounced [dɛːmɛ́ːtɛːr]; Doric: Δαμάτηρ Dāmā́tēr) is the goddess of the harvest and agriculture, who presided over grains and the fertility of the earth. Her cult titles include Sito (Σιτώ), "she of the Grain",[1] as the giver of food or grain,[2] and Thesmophoros (θεσμός, thesmos: divine order, unwritten law; φόρος, phoros: bringer, bearer), "Law-Bringer", as a mark of the civilized existence of agricultural society.[3] Though Demeter
Demeter
is often described simply as the goddess of the harvest, she presided also over the sacred law, and the cycle of life and death. She and her daughter Persephone
Persephone
were the central figures of the Eleusinian Mysteries
Eleusinian Mysteries
that predated the Olympian pantheon
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Negative Infinity
In mathematics, the affinely extended real number system is obtained from the real number system ℝ by adding two elements: + ∞ and – ∞ (read as positive infinity and negative infinity respectively). These new elements are not real numbers. It is useful in describing various limiting behaviors in calculus and mathematical analysis, especially in the theory of measure and integration
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Euclidean Space
In geometry, Euclidean space
Euclidean space
encompasses the two-dimensional Euclidean plane, the three-dimensional space of Euclidean geometry, and certain other spaces. It is named after the Ancient Greek mathematician Euclid of Alexandria.[1] The term "Euclidean" distinguishes these spaces from other types of spaces considered in modern geometry. Euclidean spaces also generalize to higher dimensions. Classical Greek geometry defined the Euclidean plane and Euclidean three-dimensional space using certain postulates, while the other properties of these spaces were deduced as theorems. Geometric constructions are also used to define rational numbers. When algebra and mathematical analysis became developed enough, this relation reversed and now it is more common to define Euclidean space
Euclidean space
using Cartesian coordinates
Cartesian coordinates
and the ideas of analytic geometry
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Conic Section
In mathematics, a conic section (or simply conic) is a curve obtained as the intersection of the surface of a cone with a plane. The three types of conic section are the hyperbola, the parabola, and the ellipse. The circle is a special case of the ellipse, and is of sufficient interest in its own right that it was sometimes called a fourth type of conic section. The conic sections have been studied by the ancient Greek mathematicians with this work culminating around 200 BC, when Apollonius of Perga
Apollonius of Perga
undertook a systematic study of their properties. The conic sections of the Euclidean plane
Euclidean plane
have various distinguishing properties. Many of these have been used as the basis for a definition of the conic sections
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Eccentricity (mathematics)
In mathematics, the eccentricity, denoted e or ε displaystyle varepsilon , is a parameter associated with every conic section
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AutoCAD
AutoCAD
AutoCAD
is a commercial computer-aided design (CAD) and drafting software application. Developed and marketed by Autodesk,[1] AutoCAD was first released in December 1982 as a desktop app running on microcomputers with internal graphics controllers.[2] Before AutoCAD was introduced, most commercial CAD programs ran on mainframe computers or minicomputers, with each CAD operator (user) working at a separate graphics terminal.[3] Since 2010, AutoCAD
AutoCAD
was released as a mobile- and web app as well, marketed as AutoCAD
AutoCAD
360. AutoCAD
AutoCAD
is used across a wide range of industries, by architects, project managers, engineers, graphic designers, and many other professionals
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Symbol
A symbol is a mark, sign, or word that indicates, signifies, or is understood as representing an idea, object, or relationship. Symbols allow people to go beyond what is known or seen by creating linkages between otherwise very different concepts and experiences. All communication (and data processing) is achieved through the use of symbols. Symbols take the form of words, sounds, gestures, ideas or visual images and are used to convey other ideas and beliefs. For example, a red octagon may be a symbol for "STOP". On a map, a blue line might represent a river. Numerals are symbols for numbers. Alphabetic letters may be symbols for sounds. Personal names are symbols representing individuals. A red rose may symbolize love and compassion
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Variable (mathematics)
In elementary mathematics, a variable is a symbol, commonly an alphabetic character, that represents a number, called the value of the variable, which is either arbitrary, not fully specified, or unknown. Making algebraic computations with variables as if they were explicit numbers allows one to solve a range of problems in a single computation. A typical example is the quadratic formula, which allows one to solve every quadratic equation by simply substituting the numeric values of the coefficients of the given equation to the variables that represent them. The concept of a variable is also fundamental in calculus. Typically, a function y = f(x) involves two variables, y and x, representing respectively the value and the argument of the function
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Unicode
Unicode
Unicode
is a computing industry standard for the consistent encoding, representation, and handling of text expressed in most of the world's writing systems. The latest version contains a repertoire of 136,755 characters covering 139 modern and historic scripts, as well as multiple symbol sets
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Codomain
In mathematics, the codomain or target set of a function is the set Y into which all of the output of the function is constrained to fall. It is the set Y in the notation f: X → Y. The codomain is also sometimes referred to as the range but that term is ambiguous as it may also refer to the image. The codomain is part of a function f if it is defined as described in 1954 by Nicolas Bourbaki,[1] namely a triple (X, Y, F), with F a functional subset[2] of the Cartesian product
Cartesian product
X × Y and X is the set of first components of the pairs in F (the domain). The set F is called the graph of the function. The set of all elements of the form f(x), where x ranges over the elements of the domain X, is called the image of f. In general, the image of a function is a subset of its codomain. Thus, it may not coincide with its codomain
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Miscellaneous Technical
Miscellaneous Technical is the name of a Unicode block ranging from U+2300 to U+23FF, which contains various common symbols which are related to and used in the various technical, programming language, and academic professions. Symbol
Symbol

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Apple, Inc.
Coordinates: 37°19′55″N 122°01′52″W / 37.33182°N 122.03118°W / 37.33182; -122.03118Apple Inc.The Apple Campus
Apple Campus
in Cupertino, CaliforniaFormerly calledApple Computer Company (1976–1977) Apple Computer, Inc. (1977–2007)TypePublicTraded asNASDAQ: AAPL NASDAQ-100
NASDAQ-100
component DJIA component S&P 100 component S&P 500 componentISIN US0378331005IndustryComputer hardware Computer software Consumer electronics Digital distribution Semiconductors Fabless silicon design Corporate venture capitalFounded April 1, 1976; 42 years ago (1976-04-01)FoundersSteve Jobs Steve Wozniak Ronald WayneHeadquarters Apple Park, 1 Apple Park
Apple Park
Way, Cupertino, California, U.S.Number of locations499 retail stores (2017)Area servedWorldwideKey people Arthur D
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Macintosh
The Macintosh
Macintosh
(/ˈmækɪnˌtɒʃ/ MAK-in-tosh; branded as Mac since 1998) is a family of personal computers designed, manufactured, and sold by Apple Inc.
Apple Inc.
since January 1984
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