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 function of literature, through all its mutations, has been to make us aware of the particularity of selves, and the high authority of the self in its quarrel with its society and its culture. Literature is in that sense subversive.”
—Lionel Trilling (1905–1975)