Homepage of Benjamin Brück

I am a mathematician and currently working as a postdoc at the University of Copenhagen. My mentor is Nathalie Wahl.
I finished my PhD at Universität Bielefeld in January 2020, where my advisor was Kai-Uwe Bux. Before that, I did my Bachelor and Master studies at WWU Münster and wrote my Master thesis during a one-semester stay at Université Claude Bernard Lyon 1 under the supervision of Katrin Tent, Rizos Sklinos and Tuna Altınel.
In October, I will start a postdoctoral position (Hermann-Weyl-Instructorship) at ETH Zürich.

Contact information

benjamin.brueck.maths [at] gmail.com

Research interests

Geometric Group Theory; Topology; Model Theory; RAAGs and their automorphism groups, in particular free groups; Coxeter groups; Buildings


Recent and upcoming talks

Seminar on Nonlinear Algebra, MPI MiS Leipzig, July 2020

Heriot-Watt algebra online seminar, April 2020

Algebra and Geometry Seminar, Bristol, March 2020

Junior Geometry Seminar (BRIJGES), Bristol, March 2020

Group theory days in Düsseldorf, Düsseldorf, January 2020

Max Dehn Seminar, Salt Lake City, October 2019

Mini Max Dehn Seminar, Salt Lake City, October 2019

Southampton-Bielefeld Geometric Group Theory Meeting, Southampton, September 2019

Algebra/Topology Seminar, Copenhagen, September, 2019

Oberseminar Modelltheorie, Geometrie und Gruppentheorie, Münster, June 2019

AG-Seminar Topologie, Karlsruhe, June 2019

Oberseminar Algebra und Geometrie, Magdeburg, April 2019

SPP 2026 - Geometry at infinity conference, Münster, April 2019; Slides of this talk

"Reflections and harmonies: Coxeter groups in music theory" - SYMBol, Bielefeld, February 2019

Bielefeld-Münster Seminar on Groups, Geometry and Topology, January 2019

Junior Topology and Group Theory Seminar, Oxford, October 2018

"Higher connectivity of free factor complexes" - Poster presented at Geometric Group Theory in Campinas, July 2018

Junior Geometry and Topology Seminar (GATEWAY), Warwick, April 2018

BKMR Research Seminar on Geometric Group Theory, Münster, August 2017

Bielefeld-Münster Seminar on Groups, Geometry and Topology, Bielefeld, July 2017

Oberseminar Gruppen und Geometrie, Bielefeld, June 2016

Oberseminar Modelltheorie, Geometrie und Gruppentheorie, Münster, May 2016

Models and Groups 6, Istanbul, March 2016

Longer research stays

In October and November 2019, I visited Mladen Bestvina at the University of Utah.

In October and November 2018, I visited Ric Wade at the University of Oxford.


In Bielefeld, I was organising a weekly meeting on geometric group theory: Friday GGT.

I was one of the organisers of the conference Outer Space in Bielefeld which took place in Bielefeld from 24th to 26th of September 2019.

I was one of the organisers of the block seminar Arithmetic groups and Rigidity which took place in Bielefeld from 21st to 23rd of March 2018. A shortened pdf-version of the introduction I gave at this seminar can be found here.


In the winter semester 2019/2020, I supervised a bachelor thesis with the title "Ordnungen in quadratischen Zahlkörpern" in Bielefeld.
In the winter semester 2017/2018, I was leading the discussion session for the course Groups acting on trees.
In 2016 and 2017, I held tutorials for the lectures Analysis II, Algebra I, Riemannian Geometry and Ordinary differential equations in Bielefeld.
From 2013 to 2015, I gave tutorials in Münster for the lectures Analysis II, Introduction to Algebra, Quadratic Forms, Higher Algebra I and Stable Groups.


The following link leads to a petition asking to free Tuna Altınel, who was arrested in Turkey: Free Tuna Altınel. Further information can be found here.

I am a member of the Copenhagen Centre for Geometry and Topology GeoTop.