Brenti's Open Problem on the Real-Rootedness of q-Eulerian Polynomials of Type D

Brenti's Open Problem on the Real-Rootedness of q-Eulerian Polynomials of Type D
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DOI:
10.1137/16m1084651
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发表时间:
2017-05
期刊:
SIAM J. Discret. Math.
影响因子:
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通讯作者:
A. Yang;Philip B. Zhang
A. Yang;Philip B. Zhang
中科院分区:
其他
文献类型:
--
作者:
A. Yang;Philip B. Zhang

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我们证明,对于任何正 $q$,$D$ 类型的 $q$-欧拉多项式只有实数零。这解决了 Brenti 在 1994 年提出的一个开放问题。对于 $q=1$,我们的结果简化为 $D$ 型欧拉多项式的实根性,这最初是由 Brenti 猜想的,最近由 Savage 和 Visontai 证明。
We prove that, for any positive $q$, the $q$-Eulerian polynomial of type $D$ has only real zeros. This settles an open problem of Brenti in 1994. For $q=1$, our result reduces to the real-rootedness of the Eulerian polynomials of type $D$, which was originally conjectured by Brenti and recently proved by Savage and Visontai.