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arXiv 2101.04517math.COmath.ACmath.AG
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关于Shi和Linial排列的Falk不变量

On the Falk invariant of Shi and Linial arrangements

Weili Guo, Michele Torielli

摘要:

超平面排列的Falk不变量,即超平面排列的基本群的下中心序列中的三阶连续项的组合解释,是一个有待解决的问题。在这篇文章中,我们给出了一个组合公式的情况下,这个不变量的超平面安排,某些增益图的完全提升表示。作为推论,我们计算的辫子,施,线性和半序安排的锥的福尔克不变量。

英文摘要:

It is an open question to give a combinatorial interpretation of the Falk invariant of a hyperplane arrangement, i.e. the third rank of successive quotients in the lower central series of the fundamental group of the arrangement. In this article, we give a combinatorial formula for this invariant in the case of hyperplane arrangements that are complete lift representation of certain gain graphs. As a corollary, we compute the Falk invariant for the cone of the braid, Shi, Linial and semiorder arrangements.

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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