Conjecture on Hurwitz actions and reduced decompositions of braid Coxeter elements
Conjecture on Hurwitz actions and reduced decompositions of braid Coxeter elements
In either of the two settings, let be the associated braid group, let be the corresponding Coxeter or complex reflection group, let be the natural map, and let and be respectively the sets of braid reflections and reflections. Let be the rank, let act by Hurwitz moves, and let and denote the reduced decompositions of and into elements of and . For a braid Coxeter element , write , and let and be the reflections appearing in these reduced decompositions. The reduced-decomposition conjecture. There exists a braid Coxeter element such that: (1) the Hurwitz action is transitive on ; (2) the Hurwitz action is transitive on ; (3) the map induces an isomorphism of -sets from to ; and (4) the map induces a bijection from to . The conjecture is proved for the universal Coxeter group and braid group, and substantial cases are known for finite Coxeter groups and affine type ; the general statement, including the complex-reflection-group setting, remains open.
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Sources & referencesView supporting material
Primary source
David Bessis, “A dual braid monoid for the free group”, arXiv:math/0401324 (2004).
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