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- Function_(mathematics) abstract "In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. An example is the function that relates each real number x to its square x2. The output of a function f corresponding to an input x is denoted by f(x) (read \"f of x\"). In this example, if the input is −3, then the output is 9, and we may write f(−3) = 9. Likewise, if the input is 3, then the output is also 9, and we may write f(3) = 9. (The same output may be produced by more than one input, but each input gives only one output.) The input variable(s) are sometimes referred to as the argument(s) of the function.Functions of various kinds are \"the central objects of investigation\" in most fields of modern mathematics. There are many ways to describe or represent a function. Some functions may be defined by a formula or algorithm that tells how to compute the output for a given input. Others are given by a picture, called the graph of the function. In science, functions are sometimes defined by a table that gives the outputs for selected inputs. A function could be described implicitly, for example as the inverse to another function or as a solution of a differential equation.The input and output of a function can be expressed as an ordered pair, ordered so that the first element is the input (or tuple of inputs, if the function takes more than one input), and the second is the output. In the example above, f(x) = x2, we have the ordered pair (−3, 9). If both input and output are real numbers, this ordered pair can be viewed as the Cartesian coordinates of a point on the graph of the function.In modern mathematics, a function is defined by its set of inputs, called the domain; a set containing the set of outputs, and possibly additional elements, as members, called its codomain; and the set of all input-output pairs, called its graph. Sometimes the codomain is called the function's \"range\", but more commonly the word \"range\" is used to mean, instead, specifically the set of outputs (this is also called the image of the function). For example, we could define a function using the rule f(x) = x2 by saying that the domain and codomain are the real numbers, and that the graph consists of all pairs of real numbers (x, x2). The image of this function is the set of non-negative real numbers. Collections of functions with the same domain and the same codomain are called function spaces, the properties of which are studied in such mathematical disciplines as real analysis, complex analysis, and functional analysis.In analogy with arithmetic, it is possible to define addition, subtraction, multiplication, and division of functions, in those cases where the output is a number. Another important operation defined on functions is function composition, where the output from one function becomes the input to another function.".
- Function_(mathematics) thumbnail Function_machine2.svg?width=300.
- Function_(mathematics) wikiPageExternalLink visual.calculus.
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- Function_(mathematics) wikiPageExternalLink algebra-functions.
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- Function_(mathematics) wikiPageWikiLink 1_(number).
- Function_(mathematics) wikiPageWikiLink Abstract_algebra.
- Function_(mathematics) wikiPageWikiLink Addison-Wesley.
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- Function_(mathematics) wikiPageWikiLink Associative_property.
- Function_(mathematics) wikiPageWikiLink Axiom.
- Function_(mathematics) wikiPageWikiLink Axiom_of_choice.
- Function_(mathematics) wikiPageWikiLink Bijection.
- Function_(mathematics) wikiPageWikiLink Binary_operation.
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- Function_(mathematics) wikiPageWikiLink Busy_beaver.
- Function_(mathematics) wikiPageWikiLink Cardinality.
- Function_(mathematics) wikiPageWikiLink Cartesian_coordinate_system.
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- Function_(mathematics) wikiPageWikiLink Categorification.
- Function_(mathematics) wikiPageWikiLink Category:Basic_concepts_in_set_theory.
- Function_(mathematics) wikiPageWikiLink Category:Elementary_mathematics.
- Function_(mathematics) wikiPageWikiLink Category:Functions_and_mappings.
- Function_(mathematics) wikiPageWikiLink Category_of_sets.
- Function_(mathematics) wikiPageWikiLink Category_theory.
- Function_(mathematics) wikiPageWikiLink Class_(set_theory).
- Function_(mathematics) wikiPageWikiLink Closure_(mathematics).
- Function_(mathematics) wikiPageWikiLink Codomain.
- Function_(mathematics) wikiPageWikiLink Complex_analysis.
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- Function_(mathematics) wikiPageWikiLink Computability_theory.
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- Function_(mathematics) wikiPageWikiLink Convex_function.
- Function_(mathematics) wikiPageWikiLink Correspondence_(mathematics).
- Function_(mathematics) wikiPageWikiLink Countable_set.
- Function_(mathematics) wikiPageWikiLink Currying.
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- Function_(mathematics) wikiPageWikiLink Cut-the-Knot.
- Function_(mathematics) wikiPageWikiLink D._C._Heath_and_Company.
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- Function_(mathematics) wikiPageWikiLink Euclidean_algorithm.
- Function_(mathematics) wikiPageWikiLink Even_and_odd_functions.
- Function_(mathematics) wikiPageWikiLink Factorial.
- Function_(mathematics) wikiPageWikiLink Fiber_(mathematics).
- Function_(mathematics) wikiPageWikiLink File:Function_image_and_preimage_3.png.
- Function_(mathematics) wikiPageWikiLink Formula.
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- Function_(mathematics) wikiPageWikiLink Functional_(mathematics).
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- Function_(mathematics) wikiPageWikiLink Functor.
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- Function_(mathematics) wikiPageWikiLink Group_(mathematics).
- Function_(mathematics) wikiPageWikiLink Halting_problem.
- Function_(mathematics) wikiPageWikiLink Holomorphic_function.
- Function_(mathematics) wikiPageWikiLink Homomorphism.
- Function_(mathematics) wikiPageWikiLink Identity_element.
- Function_(mathematics) wikiPageWikiLink Image_(mathematics).
- Function_(mathematics) wikiPageWikiLink Implicit_function.
- Function_(mathematics) wikiPageWikiLink Infinity.
- Function_(mathematics) wikiPageWikiLink Infix.
- Function_(mathematics) wikiPageWikiLink Injective_function.