Title: Strongly cospectral vertices in cubelike graphsSpeaker: Soffia Arnadottir Affiliation: University of Waterloo Room: MC 5417
A cubelike graph is a Cayley graph of the elementary abelian 2-group. Two vertices in a graph are strongly copsectral if they are cospectral and parallel.
Title: Combinatorial Hall algebrasSpeaker: Matt Szczesny Affiliation: Boston University Room: MC 5417
The Hall algebra of a finitary category is an associative (and sometimes Hopf) algebra whose structure constants count the number of extensions between objects.