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arXiv 2103.00890math.CO
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欧拉变换

The Eulerian transformation

Petter Brändén, Katharina Jochemko

摘要:

欧拉多项式是组合学和代数学的基础。本文研究了由$\mathcal{A}(t^n) = A_n(t)$定义的线性变换$\mathcal{A} : \mathbb{R}[t] \to \mathbb{R}[t]$,其中$A_n(t)$表示$n$阶欧拉多项式.我们给出了组合,拓扑和Ehrhart理论的运营商$\mathcal{A}$的解释,并调查单峰性和实根性的问题。特别地,我们反驳了Brenti(1989)关于实零点保持的猜想,并推广和加强了Haglund和Zhang(2019)关于二项式欧拉多项式的最新结果。

英文摘要:

Eulerian polynomials are fundamental in combinatorics and algebra. In this paper we study the linear transformation $\mathcal{A} : \mathbb{R}[t] \to \mathbb{R}[t]$ defined by $\mathcal{A}(t^n) = A_n(t)$, where $A_n(t)$ denotes the $n$-th Eulerian polynomial. We give combinatorial, topological and Ehrhart theoretic interpretations of the operator $\mathcal{A}$, and investigate questions of unimodality and real-rootedness. In particular, we disprove a conjecture by Brenti (1989) concerning the preservation of real zeros, and generalize and strengthen recent results of Haglund and Zhang (2019) on binomial Eulerian polynomials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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