Math Department
MINERVA MINI-COURSE

Alex Lubotzky, Weizmann Institute, The Hebrew University, and Minerva Distinguished Visitor
Expanders and Ramanujan graphs
Wednesday, Sep 27
Fine Hall Common Room
12:15 PM – 1:15 PM
https://www.math.princeton.edu/events/expanders-and-ramanujan-graphs-2023-09-27t161500 

Expander graphs are of fundamental importance in computer science and in recent years, also in several areas of mathematics. A brilliant insight of Margulis showed their connection with representation theory (Kazhdan Property T) and paved the way to use the theory of automorphic forms to construct ``optimal" expanders (a.k.a. Ramanujan graphs) based on the work of Deligne and Drinfeld on the Ramanujan conjecture for GL(2)(2).