# Vorträge im Wintersemester 2024/25

### 10 Oct - Sam Shepherd. One-ended halfspaces in group splittings

I will introduce the notion of halfspaces in group splittings and discuss the problem of when these halfspaces are one-ended. I will also discuss connections to JSJ splittings of groups, and to determining whether groups are simply connected at infinity. This is joint work with Michael Mihalik.

### 17 Oct - Silke Meißner. 2-ample theories and pseudo-buildings

Zilber showed the following for strongly minimal theories T: if T is 1-ample, or equivalently non-linear, then T interprets a pseudoplane. I will show a way in which this result can be generalised to theories which are 2-ample, or equivalently not CM-trivial. We will call the corresponding interpretable objects pseudo-buildings, where the notion of a building was originally introduced by Tits in order to study algebraic groups. This is joint work with Katrin Tent.

### 24 Oct - Floris Vermeulen

tba

### 31 Oct - Tingxiang Zou

tba

### 4 Nov - Sam Hughes - Monday 14:00-15:00 Joint with the topology seminar

room and abstract tba

https://www.uni-muenster.de/Topologie/researchseminars/ostoposs2425.html

### 7 Nov - Alf Onshuus

tba

### 14 Nov - Kai-Uwe Bux

tba

### 5 Dec - Dana Bartosova

tba