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arXiv 2406.19962math.COmath.RT
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拟阵的等变Kazhdan-Lusztig多项式的删除公式

Deletion formulas for equivariant Kazhdan-Lusztig polynomials of matroids

Luis Ferroni, Jacob P. Matherne, Lorenzo Vecchi

AI总结:

本文研究拟阵的等变Kazhdan-Lusztig多项式,提出删除公式,并应用于粘合环的图拟阵及余秩2拟阵的计算,扩展了已有结果。

摘要:

我们研究拟阵的等变Kazhdan-Lusztig(KL)和$Z$-多项式。我们提出了Braden和Vysogorets的一个结果的等变推广,该结果将拟阵的等变KL和$Z$-多项式与单元素删除的相应多项式联系起来。我们还讨论了$Z$-多项式的等变$\gamma$-正性的失败。作为我们主要结果的一个应用,我们获得了通过粘合两个环得到的图拟阵的等变KL多项式的公式。此外,我们通过赋值计算了所有余秩为$2$的拟阵的等变KL多项式。这提供了Elias、Miyata、Proudfoot和Vecchi的机制对余秩$2$拟阵的一个应用,并扩展了Ferroni和Schröter的结果。

英文摘要:

We study equivariant Kazhdan--Lusztig (KL) and $Z$-polynomials of matroids. We formulate an equivariant generalization of a result by Braden and Vysogorets that relates the equivariant KL and $Z$-polynomials of a matroid with those of a single-element deletion. We also discuss the failure of equivariant $γ$-positivity for the $Z$-polynomial. As an application of our main result, we obtain a formula for the equivariant KL polynomial of the graphic matroid gotten by gluing two cycles. Furthermore, we compute the equivariant KL polynomials of all matroids of corank~$2$ via valuations. This provides an application of the machinery of Elias, Miyata, Proudfoot, and Vecchi to corank $2$ matroids, and it extends results of Ferroni and Schröter.

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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