Choice function
Mathematical function / From Wikipedia, the free encyclopedia
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For the combinatorial choice function C(n, k), see Combination and Binomial coefficient.
A choice function (selector, selection) is a mathematical function f that is defined on some collection X of nonempty sets and assigns some element of each set S in that collection to S by f(S); f(S) maps S to some element of S. In other words, f is a choice function for X if and only if it belongs to the direct product of X.