In mathematics, an indicator function or a characteristic function is a function defined on a set that indicates membership of an element in a subset of, having the value 1 for all elements of A and the value 0 for all elements of X not in A.
Read more about Indicator Function: Definition, Remark On Notation and Terminology, Basic Properties, Mean, Variance and Covariance, Characteristic Function in Recursion Theory, Gödel's and Kleene's representing Function, Characteristic Function in Fuzzy Set Theory
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“Our father has an even more important function than modeling manhood for us. He is also the authority to let us relax the requirements of the masculine model: if our father accepts us, then that declares us masculine enough to join the company of men. We, in effect, have our diploma in masculinity and can go on to develop other skills.”
—Frank Pittman (20th century)