University of Sydney Algebra Seminar

Justin Koonin (University of Sydney)

Friday 7th December, 12:05-12:55pm, Carslaw 175

Topology of eigenspace posets for unitary reflection groups

The eigenspace theory of unitary reflection groups, initiated by Springer and Lehrer, suggests that the following object is worthy of study: the poset of eigenspaces of elements of a unitary reflection group, for a fixed eigenvalue, ordered by the reverse of inclusion. We investigate topological properties of this poset. The new results extend the well-known work of Orlik and Solomon on the lattice of intersections of hyperplanes.