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• W2267123557 abstract "Let $V$ be an $n$ dimensional vector space over an algebraic closure of a finite field $F_q$ and put $G = GL(V)$. For a positive integer $r$, we consider the variety $X_{uni} = G_{uni} times V^{r-1}$, on which $G$ acts diagonally. $X_{uni}$ is the unipotent part of the enhanced variety of level $r$. $X_{uni}$ is partitioned into finitely many pieces $X_{lambda}$ labelled by $r$-partitions $lambda$ of $n$, and we consider the intersection cohomology $IC_{lambda}$ associated to $X_{lambda}$. In this paper, we show that the Frobenius trace functions (over $F_q$) associated to those $IC_{lambda}$ satisfy certain orthogonality relations, which are very close to the equations characterizing the Kostka functions indexed by (a pair of) $r$-partitions. Using this we show, in some special cases, that the Kostka functions can be described in terms of those intersection cohomology, which is a (partial) generalization of the known results for the case $r = 1, 2$." @default.
• W2267123557 created "2016-06-24" @default.
• W2267123557 creator A5035067793 @default.
• W2267123557 date "2015-07-05" @default.
• W2267123557 modified "2023-09-27" @default.
• W2267123557 title "Enhanced variety of higher level and Kostka functions associated to complex reflection groups" @default.
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• W2267123557 hasPublicationYear "2015" @default.
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