Coxeter Pop-Tsack Torsing
Coxeter Pop-Tsack Torsing
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考克塞特 Pop-Tsack 扭转
DOI:
10.5802/alco.226
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发表时间:
2021
影响因子:
--
通讯作者:
Nathan Williams
中科院分区:
文献类型:
--
作者:
Colin Defant;Nathan Williams
Given a finite irreducible Coxeter group W with a fixed Coxeter element c , we define the Coxeter pop-tsack torsing operator Pop T : W → W by Pop T ( w ) = w · π T ( w ) − 1 , where π T ( w ) is the join in the noncrossing partition lattice NC( w,c ) of the set of reflections lying weakly below w in the absolute order. This definition serves as a “Bessis dual” version of the first author’s notion of a Coxeter pop-stack sorting operator, which, in turn, generalizes the pop-stack sorting map on symmetric groups. We show that if W is coincidental or of type D , then the identity element of W is the unique periodic point of Pop T and the maximum size of a forward orbit of Pop T is the Coxeter number h of W . In each of these types, we obtain a natural lift from W to the dual braid monoid of W . We also prove that W is coincidental if and only if it has a unique forward orbit of size h . For arbitrary W , we show that the forward orbit of c − 1 under Pop T has size h and is isolated in the sense that none of the non-identity elements of the orbit have preimages lying outside of the orbit.
影响因子:
1.3
作者:
Federico Ardila;F. Rincón;L. Williams
通讯作者:
Federico Ardila;F. Rincón;L. Williams