The Mathematical and Computational Sciences at Western are represented by four separate departments: Applied Mathematics, Computer Science, Mathematics, and Statistical & Actuarial Sciences. The Department of Mathematics has established research groups in several areas of contemporary mathematics including algebra, analysis and analytic geometry, homotopy theory, and noncommutative geometry.

Each week the Department of Mathematics hosts a wide variety of seminars and events. For a comprehensive list of events, please consult our departmental calendar.

I will define expander and Ramanujan graphs and give a
variety of existence results. Most notably I will state a joint result of D. Puder, W. Sawin, and myself on so-called Ramanujan covers of graphs. Our result generalizes one of several recent celebrated joint results of A. Marcus, D.
Spielman, and N. Srivastava.