The Bruhat--Chevalley order on involutions of the hyperoctahedral group and combinatorics of $B$-orbit closures

Details The Bruhat--Chevalley order on involutions of the hyperoctahedral group and combinatorics of $B$-orbit closures The Bruhat--Chevalley order on involutions of the hyperoctahedral group and combinatorics of $B$-orbit closures

2011-12-12

arxiv.org/abs/1112.2624v1

Mathematics

Representation Theory

13 pages

Scientific paper

Let $G$ be the symplectic group, $\Phi=C_n$ its root system, $B\subset G$ its standard Borel subgroup, $W$ the Weyl group of $\Phi$. To each involution $\sigma\in W$ one can assign the $B$-orbit $\Omega_{\sigma}$ contained in the dual space of the Lie algebra of the unipotent radical of $B$. We prove that $\Omega_{\sigma}$ is contained in the Zariski closure of $\Omega_{\tau}$ if and only of $\sigma\leq\tau$ with respect to the Bruhat--Chevalley order. We also prove that $\dim\Omega_{\sigma}$ is equal to $l(\sigma)$, the length of $\sigma$ in $W$.

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