Northwestern Events Calendar
Oct
30
2025

Pinsky Lecture Series | Alex Lubotzky (Weizmann Institute, Hebrew University)

When: Thursday, October 30, 2025
4:00 PM - 5:00 PM CT

Where: Lunt Hall, 105, 2033 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students

Contact: Antonio Auffinger   (847) 491-5524
tuca@northwestern.edu

Group: Department of Mathematics: Special Events

Category: Lectures & Meetings

Description:

Title:  Topological expanders 

Abstract: Gromov's overlapping problems led to the notions of geometric and topological expanders. These problems have been solved by using the high-dimensional expanders ( a.k.a. Ramanujan complexes). We will survey these developments, Then we will point out how the methods developed there MAY be useful to tackle the holy grail open                               problem of group approximation theory: are all groups sofic? Based on joint works with Kaufman, Kazhdan, Evra, Chapman, and Dikstein. 

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