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arXiv 1509.07413math.RT
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复反射群的Kostka函数

Kostka functions associated to complex reflection groups

Toshiaki Shoji

摘要:

与复反射群相关联的Kostka函数$K^{\pm}_{λ, μ}(t)$是Kostka多项式的推广,其由一对$r$划分和符号$+, -$的$λ, μ$索引。可以预期,这些Kostka函数和与$r$级的增强变体$X$相关联的交叉上同调之间存在密切联系。本文利用$X$的几何性质研究了Kostka函数的组合性质.特别地,我们证明了如果$μ$是$μ= (-,\dots, -, ξ)$的形式和$λ$是任意的,$K^-_{λ, μ}(t)$有一个Lascoux-Schützenberger型组合描述。

英文摘要:

Kostka functions $K^{\pm}_{λ, μ}(t)$ associated to complex reflection groups are a generalization of Kostka polynomials, which are indexed by a pair $λ, μ$ of $r$-partitions and a sign $+, -$. It is expected that there exists a close connection between those Kostka functions and the intersection cohomology associated to the enhanced variety $X$ of level $r$. In this paper, we study combinatorial properties of Kostka functions by making use of the geometry of $X$. In particular, we show that if $μ$ is of the form $μ= (-,\dots, -, ξ)$ and $λ$ is arbitrary, $K^-_{λ, μ}(t)$ has a Lascoux-Schützenberger type combinatorial description.

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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