Finite orbits of the braid group action on sets of reflections
Alexandre Stefanov
Abstract
The finite orbits of the braid group action on Stokes matrices are studied and are shown to be the orbits on ordered sets of reflections, generating finite groups. All invariants of a reflection arrangement are determined. Determination of the orbits of the braid group on non-redundant generaing reflections in finite groups is done in a new way. The original idea is to introduce universal sets of generators in each group. These sets are found for all finite Coxeter groups. The orbits are classified for non-degenerate arrangement matrices.
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