# Colloquia

**UW Madison mathematics Colloquium is on Fridays at 4:00 pm. **

# Fall 2021

## Sep. 17, 2021 , Mark Shusterman (Harvard)

(hosted by Gurevich)

**Finitely Presented Groups in Arithmetic Geometry**

I will report on recent works, in part joint with Esnault—Srinivas, and with Jarden, on the finite presentability of several (profinite) groups arising in algebraic geometry and in number theory. These results build on a cohomological criterion of Lubotzky involving Euler characteristics. I will try to explain the analogy, rooted in arithmetic topology, between these results and classical facts about fundamental groups of three-dimensional manifolds.

## Sep. 24, 2021 , Sean Paul (UW-Madison)

## October 8, 2021 , Jon Chapman (University of Oxford)

(Wasow lecture; hosted by Thiffeault)

## October 11, 13, 15, 2021 **[Mon, Wed, Fri 4-5pm]**, Geordie Williamson (University of Sydney)

(Special lecture series; hosted by Gurevich)

## October 29, 2021 , Alexandru Ionescu (Princeton University)

(hosted by Wainger)

## November 12, 2021 , Kasso Okoudjou (Tufts University)

(hosted by Stovall)

## Nov. 19, 2021 , TBA (TBA)

(reserved by the hiring committee)

## Dec. 3, 2021 , TBA (TBA)

(reserved by the hiring committee)

## Dec. 10, 2021 , TBA (TBA)

(reserved by the hiring committee)