Falling Factorials, Generating Functions, and Conjoint Ranking Tables

Details Falling Factorials, Generating Functions, and Conjoint Ranking Tables Falling Factorials, Generating Functions, and Conjoint Ranking Tables

2008-10-18

arxiv.org/abs/0810.3327v1

Journal of Integer Sequences, 12 (2009), Article 09.7.8

Mathematics

Combinatorics

15 pages, 3 figures

Scientific paper

We investigate the coefficients generated by expressing the falling factorial $(xy)_k$ as a linear combination of falling factorial products $(x)_l (y)_m$ for $l,m =1,...,k$. Algebraic and combinatoric properties of these coefficients are discussed, including recurrence relations, closed-form formulae, relations with Stirling numbers, and a combinatorial characterization in terms of conjoint ranking tables.

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