# Trimester Seminar

**Venue:** HIM lecture hall, Poppelsdorfer Allee 45 (or in the garden)

## every Tuesday:

13:30 - 15:00 Karen Vogtmann: Seminar for students only

## Wednesday, September 16

15:00 Hjorth: Descriptive set theory and equivalence relations

## Thursday, September 17

9:00 Przytycki: Introduction to complexes of groups

## Friday, September 18

10:00 Rigidite: Etats Generaux

## Tuesday, September 22

9:00 Przytycki: A Counterexample to Atiyah’s Conjecture (after Tim Austin)

15:00 Asger Törnquist: Borel reducibility

## Wednesday, September 23

15:00 Tobias Hartnick: Cohomology of Lie groups

## Thursday, September 24

9:00 Clara Löh: Simplicial Volume

15:00 Irene Peng: What is coarse differentiation

## Tuesday, September 29

15:00 Wolfgang Steimle: Rigidity and algebraic K-theory (concerning the Borel conjecture)

## Wednesday, September 30

10:00 Presentation and discussion of open problems related to rigidity

## Wednesday, October 7

15:00 Jose Manuel Higes: Large scale dimensions for beginners

## Thursday, October 8

10:00 Wolfgang Lück: An introduction to topological rigidity

15:00 Jim Davis: Introduction to the Novikov Conjecture

## Friday, October 9

10:00 Michael Joachim: An introduction to the Gromov-Lawson-Rosenberg Conjecture

## Monday, October 19

15:00 George Willis: Superrigidity with general locally compact targets

## Wednesday, October 21

15:00 Diarmuid Crowley: On the classification of embeddings of smooth 4-manifolds in 7-space

## Thursday, October 22

15:00 Qayum Khan: Rigidity of connected sums of certain 4-manifolds

## Tuesday, October 27

15:00 Adam Mole: An Introduction to Relatively Hyperbolic Groups

## Wednesday, December 2

10:00 Kim Inkang: Rigidity vs flexibility in symmetric spaces

## Wednesday, December 9

10:00 Ian Hambleton: Coarse geometry and P. A. Smith theory

Further talks were given by Caprace (Kac-Moody groups), Fabig (Assembly maps), Hartnick (Bounded cohomology), Bader (Ergodic actions), Weinberger (Topological Rigidity), Sauer (Measure equivalence), Chatterjee (Algebraic Groups), Ruping (CAT(0) properties of diagram groups), Epstein (Orbit equivalence), Hjorth (Descriptive Set Theory), and Przytycki (Complexes of groups).