Title: Linear Programming and Extremal ExpandersSpeaker: Sabrina Lato Affiliation: University of Waterloo Room: MC 5417
Nozaki proved a linear programming bound on the number of vertices that depends on the eigenvalues of a graph.
Title: An equivariant basis for the cohomology of Springer fibersSpeaker: Ed Richmond Affiliation: Oklahoma State University Room: MC 5417
Springer fibers are subvarieties of the flag variety that play an important role in combinatorics and geometric representation theory. In this talk, I will discuss joint work with Martha Precup where we analyze the equivariant cohomology of Springer fibers in type A.
Title: Excluding an asymmetric group labelled graphSpeaker: Farbod Yadegarian Affiliation: University of Waterloo Room: MC 5479
There are several models of group labelled graphs. In the simpler, undirected model, for an abelian group Γ, every edge e receives a label γ(e) in Γ.