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dbpedia:Sheffer_sequence
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In mathematics, a Sheffer sequence or poweroid is a polynomial sequence, i.e., a sequence { pn(x) : n = 0, 1, 2, 3, . . . } of polynomials in which the index of each polynomial equals its degree, satisfying conditions related to the umbral calculus in combinatorics. They are named for Isador M. Sheffer.