Oberseminar Algebra und Geometrie: Eleonore Faber (Toronto): Noncommutative resolutions of discriminants of reflection groups
Wednesday, 13.07.2016 16:15 im Raum M6
Let G be a finite subgroup of GL(n,K) for a field K whose characteristic does not divide the order of G. The group G acts linearly on the polynomial ring S in n variables over K. When G is generated by reflections, then the discriminant D of the group action of G on S is a hypersurface with a singular locus of codimension 1. In this talk we give a natural construction of a noncommutative resolution of singularities of the coordinate ring of D as a quotient of the skew group ring A=S*G by the idempotent e corresponding to the trivial representation. We will explain how this can be seen in some sense as a McKay correspondence for reflection groups. This is joint work with Ragnar-Olaf Buchweitz and Colin Ingalls.
Angelegt am 07.07.2016 von Heike Harenbrock
Geändert am 07.07.2016 von Heike Harenbrock
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