Function

lastmod 2014-11-02created 2014-11-021 edits

A function is, for two non-empty sets X and Y, a relation in which every element of set X corresponds to exactly one element of set Y. Here, set X is called the domain and set Y the codomain. Also, 'the collection of elements of set Y that correspond to elements of set X' is called the range.

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• Wikipedia (en) explanation of functions