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arXiv · 1802.00769

Twisted Weak Orders of Coxeter Groups

Weijia Wang
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Abstract

In this paper, we initiate the study of the twisted weak order associated to a twisted Bruhat order for a Coxeter group and explore the relationship between the lattice property of such order and the infinite reduced words. We show that for a 2 closure biclosed set $B$ in $\Phi^+$, the $B$-twisted weak order is a non-complete meet semilattice if $B$ is the inversion set of an infinite reduced word and that the converse also holds in the case of affine Weyl groups.

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Weijia Wang. 2018-02-02. Twisted Weak Orders of Coxeter Groups. https://arxiv.org/abs/1802.00769

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