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arXiv 1802.00769math.RT
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Coxeter群的扭弱序

Twisted Weak Orders of Coxeter Groups

Weijia Wang

摘要:

本文首次研究了Coxeter群的扭Bruhat序所对应的扭弱序,并探讨了这种序的格性质与无穷约化字之间的关系.证明了对于$Φ^+$中的2闭包双闭集$B$,如果$B$是一个无限约化字的逆集,则$B$ -扭弱序是一个非完全交半格,并且在仿射外尔群的情况下,逆序也成立.

英文摘要:

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 $Φ^+$, 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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