Bruhat intervals and parabolic cosets in arbitrary Coxeter groups
Abstract
In [Journal of Pure and Applied Algebra 224 (2020), no 12, 106449], V. Mazorchuk and R. Mren (with some help by A. Hultman) prove that, given a Weyl group, the intersection of a Bruhat interval with a parabolic coset has a unique maximal element and a unique minimal element. We show that such intersections are actually Bruhat intervals also in the case of an arbitrary Coxeter group.
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