a function defined on a given set, having value 1 for every element of the set and value 0 for every element not contained in the set.
characteristic polynomial.
(maths) a function that assigns the value 1 to the members of a given set and the value 0 to its nonmembers
(statistics) a function derived from the probability distribution function that enables the distribution of the sum of given random variables to be analysed


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