2014
Mar
27

# Roman Sauer

2:30pm to 3:30pm

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2014
Mar
27

2:30pm to 3:30pm

2015
Oct
29

2:30pm to 3:30pm

Title: Avatars of small cancellation
Abstract:
In general, given a finite presentation of a group, it is very difficult (in fact algorithmically impossible) to understand the group it defines. Small cancellation theory was developped as a combinatorial condition on a presentation that allows one to understand the group it represents. This very flexible construction has many applications to construct examples of groups with specific features.

2013
Dec
05

2:30pm to 3:30pm

2014
Jan
09

2:30pm to 3:30pm

2014
Mar
06

2:30pm to 3:30pm

2013
Nov
21

2:30pm to 3:30pm

2014
Jan
02

2:30pm to 3:30pm

2014
Mar
13

2:30pm to 3:30pm

2013
Oct
31

2:30pm to 3:30pm

2017
Jun
08

11:00am to 12:00pm

Levin building, lecture hall 8

Title: “The geometry of eigenvalue extremal problems”
Abstract: When we choose a metric on a manifold we determine the spectrum of
the Laplace operator. Thus an eigenvalue may be considered as a functional
on the space of metrics. For example the first eigenvalue would be the fundamental
vibrational frequency. In some cases the normalized eigenvalues are bounded
independent of the metric. In such cases it makes sense to attempt to find
critical points in the space of metrics. In this talk we will survey two cases in
which progress has been made focusing primarily on the case of surfaces with

2013
Dec
12

2:30pm to 3:30pm

2014
Feb
20

2:30pm to 3:30pm

2017
Jan
19

4:00pm to 5:00pm

Manchester building room 2

Abstract - Equidistribution problems, originating from the classical works of Kronecker, Hardy and Weyl about equidistribution of sequences mod 1, are of major interest in modern number theory.
We will discuss how some of those problems relate to unipotent flows and present a conjecture by Margulis, Sarnak and Shah regarding an analogue of those results for the case of the horocyclic flow over a Riemann surface. Moreover, we provide evidence towards this conjecture by bounding from above the Hausdorff dimension of the set of points which do not equidistribute.

2014
Jun
12

2:30pm to 3:30pm

2014
Mar
20

2:30pm to 3:30pm