Characteristic sequence

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In mathematics, the characteristic sequence of a given sequence S is the sequence of 1's and 0's which tells you how often the elements of 'S' are in some set.

Given two sets: A \subset B and a sequence \{s_n\}_n \subset B the characteristic sequence of {sn}n with respect to the set A is {χA(sn)}n, where χA is the indicator function (or characteristic function) of A.

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