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.
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Famous quotes containing the words choice and/or function:
“When there is a choice about it, a great sacrifice is preferable to a small sacrifice, because we compensate ourselves for a great one with self-admiration, which is not possible with a small one.”
—Friedrich Nietzsche (1844–1900)
“The function of the actor is to make the audience imagine for the moment that real things are happening to real people.”
—George Bernard Shaw (1856–1950)