arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.06689math.CO
收藏

广义Stirling置换的平台与部分$γ$ -正性

Plateaux on generalized Stirling permutations and partial $γ$-positivity

Zhicong Lin, Jun Ma, Philip B. Zhang

摘要:

本文证明了广义Stirling置换的计数多项式是部分$γ$ -正的。我们的结果的Jacobi-Stirling排列的专业化证实了最近的部分$γ$ -正性猜想,由于马,叶和第二命名的作者。我们的部分$γ$ -正性展开,以及相应的$γ$ -系数的组合解释,通过上下文无关文法的机器和广义Stirling置换上的群作用获得。此外,我们还从某些多元多项式的稳定性出发,给出了部分$γ$正性的另一种方法。

英文摘要:

We prove that the enumerative polynomials of generalized Stirling permutations by the statistics of plateaux, descents and ascents are partial $γ$-positive. Specialization of our result to the Jacobi-Stirling permutations confirms a recent partial $γ$-positivity conjecture due to Ma, Yeh and the second named author. Our partial $γ$-positivity expansion, as well as a combinatorial interpretation for the corresponding $γ$-coefficients, are obtained via the machine of context-free grammars and a group action on generalized Stirling permutations. Besides, we also provide an alternative approach to the partial $γ$-positivity from the stability of certain multivariate 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。

↑