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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“The fact remains that the human being in early childhood learns to consider one or the other aspect of bodily function as evil, shameful, or unsafe. There is not a culture which does not use a combination of these devils to develop, by way of counterpoint, its own style of faith, pride, certainty, and initiative.”
—Erik H. Erikson (1904–1994)