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The γ-positivity of bivariate Eulerian polynomials via the Hetyei–Reiner action
European Journal of Combinatorics ( IF 1.0 ) Pub Date : 2020-09-04 , DOI: 10.1016/j.ejc.2020.103166 Hua Sun
中文翻译:
的 Hetyei-Reiner作用的二元欧拉多项式的正定性
更新日期:2020-09-04
European Journal of Combinatorics ( IF 1.0 ) Pub Date : 2020-09-04 , DOI: 10.1016/j.ejc.2020.103166 Hua Sun
The bivariate Eulerian polynomials are defined by where and are the number of descents of permutation in odd and even positions, respectively. In this paper, by the Hetyei–Reiner action, we show that for , the bivariate Eulerian polynomials and are -positive, namely, they can be expressed in terms of the basis with nonnegative coefficients.
中文翻译:
的 Hetyei-Reiner作用的二元欧拉多项式的正定性
二元欧拉多项式定义为 哪里 和 是排列的下降次数 分别处于奇数和偶数位置。在本文中,通过Hetyei–Reiner动作,我们证明了,二元欧拉多项式 和 是 -积极的,即可以用基础来表示 具有非负系数。