Sheffer sequence
plural of telega
plural of ectopia
plural of countable set
(mathematics) A polynomial sequence in which the index of each polynomial equals its degree, satisfying conditions related to the umbral calculus in combinatorics.
組合せ論では、各多項式の添え字がその次数に等しい多項式列（シェッファー列）が、ウンブラル作用素に対応する多項式族として現れることが多い。
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