Extension
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- The act of extending or the state of being extended; a stretching out; enlargement in breadth or continuation of length; increase; augmentation; expansion.
- That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension")
- Capacity of a concept or general term to include a greater or smaller number of objects; -- correlative of intension.
Extension may refer to:
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Computing
- Filename extension, suffix to the name of a computer file, designed to show its format
- Software extension, a file containing programming that serves to extend the capabilities of or data available to a more basic program
- Extension (Mac OS), particular type of this software
- Mozilla extensions for Firefox and other Mozilla projects
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Mathematics
In mathematics, the word "extension" has many uses. It can refer to:
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Analysis
- Carathéodory's extension theorem
- Continuous linear extension
- M. Riesz extension theorem
- Krein extension theorem
- Hahn–Banach theorem
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Algebra
- Abelian extension
- Algebraic extension
- Artin–Schreier extension
- Central extension
- Cyclotomic extension—see abelian extension
- Degree of a field extension
- Dual basis in a field extension
- Extension and contraction of ideals
- Extension of modules
- Extension problem
- Field extension
- Galois extension
- Group extension
- Integral extension
- Kernel extension theorem
- Kummer extension
- Normal extension
- Quadratic extension
- Quadratic field extension
- Ring extension
- Separable extension
- Simple extension
- Splitting of prime ideals in Galois extensions
- Trivial extension—see field extension
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Algebraic geometry
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Differential geometry
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Logic or set theory
- Axiom of extensionality
- Extensible cardinal
- Extension (model theory)
- Extension (predicate logic), the set of tuples of values that satisfy the predicate
- Extensionality
- Extension (semantics), the set of things to which a property is applied
- Extensional definition, a definition that enumerates every individual a term applies to
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Order theory
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Probability theory
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Topology
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Geometry
- Exterior algebra, Grassmann's theory of extension.
- Extension of a polyhedron
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Anatomy
- Extension, general term denoting movement of limb away from body
- Extension (kinesiology), movement of a joint whereby one part of the body is moved away from another
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Music
- Extension (music), notes that fit outside the standard range
- Extension (album), 1964 album by American saxophonist George Braith
- Extensions (Ahmad Jamal album), 1965
- Extensions (McCoy Tyner album), 1970
- Extensions (Dave Holland album), 1988
- Extensions (The Manhattan Transfer album), 1979
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Other uses
- The building of community capacity by outsiders, for instance agricultural extension
- Extension (geology), relating to the pulling apart of the Earth's crust and lithosphere
- Extension (metaphysics), the property of taking up space
- Extension (telephone), telephone line attached to a main line or to a PBX or Centrex system
- Extension cord, power cable with a plug on one end and one or more sockets on the other end
- Extension locus, the gene locus of Melanocortin 1 receptor
- Continuing education, or extension school, a school for continuing education
- Extension, British Columbia, village near Regional District of Nanaimo, British Columbia, Canada
- Extension, Louisiana
- Eyelash extensions, material applied to eyelashes
- Hair extensions, strands of hair added to existing hair
Unless indicated otherwise, the text in this article is either based on Wikipedia article "Extension" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.