Talks
Spring 2017

Ramanujan Covers
Monday, Jan. 30, 2017 2:55 pm – 3:40 pm PST
Event:
Speaker:
Location:
Calvin Lab Auditorium
The breakthrough work of Marcus, Spielman, and Srivastava showed that every bipartite Ramanujan graph has a bipartite Ramanujan double cover. Chris Hall, Doron Puder, and I generalized this to covers of arbitrary degree. I will explain the proof, with emphasis on how group theory and representation theory are useful for this problem.