Leon
Pernak
Uni Saarland
Group Theory and Friends  📅
Institute
Head
Laura Ciobanu
Organizer
Laura Ciobanu
Description
This seminar is organized by the Applied Algebra Group at TU Berlin. It covers topics in group theory and related areas.
Usual time
Wednesdays at 14:30 (biweekly)
Usual venue
TU Berlin, MA Building
Number of talks
7
December 2025
November 2025
Kevin
Li
FU Berlin
On higher coherence of RAAGs
Abstract.
A group is called coherent if every finitely generated subgroup is finitely presented. It is a classical result of Droms that a RAAG is coherent if and only if the defining graph is chordal. I will explain its proof and our attempt to generalise it to higher coherence. Ongoing joint work with Luis Jorge Sánchez Saldaña.
October 2025
Mireille
Soergel
TUB
Dual Artin groups
Abstract.
In 1998 when considering a new approach to the word and conjugacy problem in Braid groups, Birman-Ko-Lee introduce a new presentation for the braid group. This is now referred to as the dual presentation. Such dual presentations can be defined for all Artin groups. I will introduce standard and dual Artin groups and talk about some open conjectures.
Tamara
Imanuel
Das Konjugationsproblem in RAAGs: Theorie und Algorithmus
Alex
Levine
University of East Anglia
The Diophantine problem in Thompson's group F
Abstract.
We discuss equations in groups, and when there exists an algorithm that can decide if a given system of equations admits a solution. We mention some recent work on Thompson's groups F and T. Based on joint work with Luna Elliott.
Nico
Waldau
TU Berlin
Tits-Alternative für hyperbolische Gruppen
January 2025
Jan Moritz
Petschick
Uni Bielefeld