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arXiv 1012.5884math.CO
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什叶派-加泰罗尼亚安排的自由性

The freeness of Shi-Catalan arrangements

Takuro Abe, Hiroaki Terao

摘要:

设$W$为有限外尔群,$\A$为相应的Weyl排列. $\A$的变形是通过将$H$的几个平行移动通过垂直于$H$的正根(及其整数倍)添加到每个超平面$H\in\A$而获得的仿射布置。如果每个超平面$H\in \A$的平行超平面的数目仅取决于$H$的$W$ -轨道,则我们说变形是$W$ -等变的.证明了$W$ -等变变形的锥环在Shi-Catalan条件下是自由排列的,并给出了腔室个数的计算公式.这推广了Edelman-Reiner的Yoshinaga定理。

英文摘要:

Let $W$ be a finite Weyl group and $\A$ be the corresponding Weyl arrangement. A deformation of $\A$ is an affine arrangement which is obtained by adding to each hyperplane $H\in\A$ several parallel translations of $H$ by the positive root (and its integer multiples) perpendicular to $H$. We say that a deformation is $W$-equivariant if the number of parallel hyperplanes of each hyperplane $H\in \A$ depends only on the $W$-orbit of $H$. We prove that the conings of the $W$-equivariant deformations are free arrangements under a Shi-Catalan condition and give a formula for the number of chambers. This generalizes Yoshinaga's theorem conjectured by Edelman-Reiner.

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