A choice function (selector, selection) is a mathematical function f that is defined on some collection X of nonempty sets and assigns to each set S in that collection some element f(S) of S. In other words, f is a choice function for X if and only if it belongs to the direct product of X.
Read more about Choice Function: An Example, History and Importance, Refinement of The Notion of Choice Function
Famous quotes containing the words choice and/or function:
“Sleeping in a bed—it is, apparently, of immense importance. Against those who sleep, from choice or necessity, elsewhere society feels righteously hostile. It is not done. It is disorderly, anarchical.”
—Rose Macaulay (1881–1958)
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—Frank Pittman (20th century)