Title: Closure of Deodhar componentsSpeaker: Kartik Singh Affiliation: University of Waterloo Location: MC 6029
There will be a pre-seminar presenting relevant background at the beginning graduate level starting at 1pm.
Abstract: Deodhar decomposition of the Grassmannian is finest decomposition (that we know of) for which the components are homeomorphic to affine spaces. So, it's natural to be interested in their topology. In the talk we will try to describe a combinatorial rule that can possibly describe the closure of Deodhar decomposition. This work is joint with Olya Mandelshtam and Kevin Purbhoo.
Title: Structure in minor-closed classes of matroidsSpeaker: Jim Geelen Affiliation: University of Waterloo Location: MC 5417
Abstract: I will give a brief overview of the structure of matroids in minor-closed classes representable over a fixed finite field. Then I will discuss open problems related to extending those results to more general minor-closed classes of matroids.