Strong q-log-convexity of the Eulerian polynomials of Coxeter groups

Strong q-log-convexity of the Eulerian polynomials of Coxeter groups
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Coxeter 群欧拉多项式的强 q-log-凸性

DOI:
10.1016/j.disc.2015.05.031
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发表时间:
2014-07
影响因子:
0.8
通讯作者:
Bao-Xuan Zhu
Bao-Xuan Zhu
中科院分区:
数学3区
文献类型:
--
作者:
Lily Li Liu (刘丽);Bao-Xuan Zhu

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本文利用Coxeter群的指数母函数证明了Coxeter群的欧拉多项式的强q-log凸性。我们的证明是基于指数Riordan阵列的理论和判断多项式序列的强q-log凸性的准则,其生成函数可以由一个连分式给出。作为应用,我们统一地得到了An,B n型欧拉多项式,它们的q-模拟以及与等差数列{a,a+ d,a+ 2 d,a+ 3 d,.}相联系的广义欧拉多项式的强q-对数凸性.
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 polynomial sequences, whose generating functions can be given by a continued fraction. As applications, we get the strong q-log-convexity of the Eulerian polynomials of types A n, B n, their q-analogue and the generalized Eulerian polynomials associated to the arithmetic progression {a, a+ d, a+ 2 d, a+ 3 d,…} in a unified manner.
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