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总览 评价 刘丽 1, , 祝宝宣 2, ( 1、 曲阜师范大学数学科学学院,曲阜 273165 ; 2、 江苏师范大学数学科学学院,徐州 221116; ) 摘要: 本文借助指数发生函数,得到了Coxeter群上Eulerian多项式的强$q$-对数凸性,其证明方法基于指数Riordan矩阵和证明多
刘丽1,, 祝宝宣2,
(
1、 曲阜师范大学数学科学学院,曲阜 273165 ; 2、 江苏师范大学数学科学学院,徐州 221116; )
摘要:
本文借助指数发生函数,得到了Coxeter群上Eulerian多项式的强$q$-对数凸性,其证明方法基于指数Riordan矩阵和证明多项式序列具有强$q$-对数凸性的一个判定。由此能统一地得到$A_n,B_n$型Eulerian多项式,其$q$模拟以及与${a,a+d,a+2d,a+3d,ldots}$相关的推广Eulerian多项式的强$q$-对数凸性。
关键词:
Eulerian多项式;Coxeter群;强$q$-对数凸性;连分式
LIU Li Lily 1,, ZHU Bao-Xuan 2,
(
1、 School of Mathematical Sciences, Qufu Normal University, Qufu 273165, PR China ; 2、 School of Mathematical Sciences, Jiangsu Normal University, Xuzhou 221116, PR China; )
Abstract:
In this paper we prove the strong $q$-log-convexity of the Eulerian polynomials of Coxeter groups using their exponential generating functions. Our proof is based on the theory of exponential Riordan arrays and a criterion for determining the strong $q$-log-convexity of polynomials sequences, whose generating functions can be given by the continued fraction. As consequences, we get the strong $q$-log-convexity of the Eulerian polynomials of types $A_n,B_n$, their $q$-analogous and the generalized Eulerian polynomials associated to the arithmetic progression ${a,a+d,a+2d,a+3d,ldots}$ in a unified manner.
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