• 2017 May 04

# Amitsur Algebra: Jasbir Chahal, " A tale of three elliptic curves"

12:00pm to 1:00pm

## Location:

Manchester 209
Title: A tale of three elliptic curves.
Abstract: We will show how the arithmetic of three elliptic curves answers three old questions in the Euclidean geometry.
• 2017 Mar 23

# Amitsur Algebra: Daniel Palacin, "Pseudo-finite groups containing an involution with a finite centralizer"

12:00pm to 1:00pm

## Location:

Manchester 209
Title: Pseudo-finite groups containing an involution with a finite centralizer.
• 2017 Mar 02

# Amitsur Algebra: Lev Glebsky, " Almost Congruence Extension Property for subgroups of free groups"

12:00pm to 1:00pm

## Location:

Manchester Building, Room 209
Title: Almost Congruence Extension Property for subgroups of free groups.
Abstract.
The talk essentially based on: https://arxiv.org/abs/1606.02345
Let G be a group and H every normal subgroup N of H is an intersection of some normal subgroup of G with H. The CEP appears in group theory in different context.
The following question seems to be very difficult:
Which finitely generated subgroup of a free group has CEP?
• 2017 Feb 09

# Amitsur Algebra: Evan DeCorte, "The spectral method for geometric colouring problems"

12:00pm to 1:00pm

## Location:

Manchester Building, Room 209
Title: The spectral method for geometric colouring problems
• 2017 Jan 26

# Amitsur Algebra: Lev Glebsky, "Approximations of groups and equations over groups"

12:00pm to 1:00pm

## Location:

Manchester Building, Room 209
Title: Approximations of groups and equations over groups.
Abstract:
The talk is largely based on the paper which may be found here:
https://authors.elsevier.com/a/1UN3b4~FOr6ze
• 2017 Jan 19

# Amitsur Algebra: Yiftach Barnea, "Old and New Results on Subgroup Growth in Pro-p Groups."

12:00pm to 1:00pm

## Location:

Manchester Building, Room 209
Title: Old and New Results on Subgroup Growth in Pro-p Groups.
Abstract: I will survey our current knowledge about subgroup growth in pro-p growth. In particular I will present new solutions to long standing open problems in the area:
1. What is the minimal subgroup growth of non-$p$-adic analytic pro-$p$ groups? (Joint work with Benjamin Klopsch and Jan-Christoph Schlage-Puchta.)
2. What are the subgroup growths of the Grigorchuk group and the Gupta-Sidki groups? (Joint work with Jan-Christoph Schlage-Puchta.)
• 2017 Jan 12

# Amitsur Algebra: Uriya First, "Semisimply degenerate quadratic forms and a conjecture of Grothendieck and Serre"

12:00pm to 1:00pm

## Location:

Manchester Building, Room 209
Title: Semisimply degenerate quadratic forms and a conjecture of Grothendieck and Serre
(joint work with E. Bayer-Fluckiger)
Abstract:
• 2016 Dec 29

# Amitsur Algebra: Igor Rivin, "Random integer matrices"

12:00pm to 1:00pm

## Location:

Manchester Building, Room 209
Title: Random integer matrices
Abstract: I will discuss various models of random integer matrices, and their (occasionally surprising) properties. Some of the work discussed is joint with E. Fuchs.
• 2016 Dec 22

# Amitsur Algebra: Mark Sapir (Vanderbilt)

12:00pm to 1:00pm

## Location:

Manchester Building, Room 209
Title: On groups with quadratic Dehn functions
Abstract: This is a joint work with A. Olshanskii. We construct a finitely presented group with quadratic Dehn function and undecidable conjugacy problem.
• 2016 Dec 08

# Amitsur Algebra: George Glauberman (Chicago)

12:00pm to 1:15pm

## Location:

Manchester Building, Room 209
Title: Fixed points of finite groups on modules
Abstract: Suppose G is a finite group, p is a prime, S is a Sylow p-subgroup of G, and V is a G-module over a field of characteristic p. In some situations, an easy calculation shows that the fixed points of G on V are the same as the fixed points of the normalizer
of S in G. Generalizations of this result have been obtained previously to study the structure of G for p odd. We plan to describe a new generalization for p = 2. (This is part of joint work with J. Lynd that removes the classification of finite simple groups