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欧拉多项式的连分数对称单峰展开

The symmetric and unimodal expansion of Eulerian polynomials via continued fractions

Heesung Shin, Jiang Zeng

摘要:

本文的动机是一个猜想Brändén(欧洲J. Combin. \textbf{29}(2008年),编号~ 2,514- 531)关于广义欧拉多项式的展开式中系数的可分性,这意味着欧拉数的对称性和单峰性。我们证明了这样一个具有猜测性质的公式可以从连分数的组合理论中推导出来。我们还讨论了相应的错位公式的一个类似的展开,并证明了一个$(p,q)$ -类似的事实,即(-1)-评价的枚举多项式的排列(分别.(1)数的增加,使数的增加,使数的增加。正割数)。$(p,q)$ -类似物统一和概括了我们最近的结果(European J. Combin. \textbf{31}(2010年),编号~(1689- 1705年)和Josuat-Vergès(European J. Combin. \textbf{31}(2010年),编号~ 7,1892- 1906)。

英文摘要:

This paper was motivated by a conjecture of Brändén (European J. Combin. \textbf{29} (2008), no.~2, 514--531) about the divisibility of the coefficients in an expansion of generalized Eulerian polynomials, which implies the symmetric and unimodal property of the Eulerian numbers. We show that such a formula with the conjectured property can be derived from the combinatorial theory of continued fractions. We also discuss an analogous expansion for the corresponding formula for derangements and prove a $(p,q)$-analogue of the fact that the (-1)-evaluation of the enumerator polynomials of permutations (resp. derangements) by the number of excedances gives rise to tangent numbers (resp. secant numbers). The $(p,q)$-analogue unifies and generalizes our recent results (European J. Combin. \textbf{31} (2010), no.~7, 1689--1705.) and that of Josuat-Vergès (European J. Combin. \textbf{31} (2010), no.~7, 1892--1906).

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