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Frankfurt Airport Seminar on Groups, Geometry and Dynamics 2020




Second meeting: March 16th, 14:00 - 18:00 & March 17th, 10:00 - 16:00

Location: HOLM, Frankfurt International Airport

Registration: In order to estimate the number of participants, please register on the link below (no registration fee will be charged).


Accommodation: Please contact Mrs. Carola Mandler [] if you need help with arranging accommodation.


March 16th

14.:00-15:00 Emily Stark (University of Utah)

 Action rigidity for free products of hyperbolic manifold groups


15:15-16:15 Giles Gardam (Münster)

One-relator groups and the Haagerup property


16:15-16:45 Coffee break

16:45-17:45 Annette Karrer (KIT)

Morse boundaries of right-angled Coxeter groups


March 17th

10:15-11:15 Markus Lohrey (Siegen)

The compressed word problem for groups


11:15-11:45 Coffee break

11:45-12:45 Armin Weiß (Stuttgart)

On the isomorphism problem for virtually free groups

12:45-14:30 Lunch break

14:30-15:30 Nima Hoda (ENS Paris)

Crystallographic Helly groups


15:45-16:45 Daniel Woodhouse (University of Oxford)

Quasi-isometric rigidity of some graphs of groups



Funded by


Earlier meetings

About the seminar


Dozens of international mathematicians travel through Frankfurt International Airport every week. The surrounding Rhein-Main area hosts several universities with research-oriented math departments, which are the home of several active research groups in the broad area of group theory, geometry and dynamics.


The goal of this seminar series is to bring these two groups of people together. A particular focus is to connect local mathematicians, both young and established, with international visitors in order to learn from them and from each other. 


The thematic focus of the conference series is on geometric, analytic and ergodic theoretical aspects of groups and their actions, but the conferences aim to explore also related areas of mathematics from representation theory and harmonic analysis over differential and metric geometry to topology, algebraic geometry and model theory, as well as to set a spotlight on newly emerging areas.


International mathematicians travelling through the Rhein-Main area (or their hosts) are welcome to contact the organizers to schedule a talk. We would also like to provide opportunities for young mathematicians to present their work; those are welcome to contact us as well.


The seminar takes place as the House of Logistics and Mobility (HOLM), which is in close proximity to Frankfurt International Airport. It is currently organized by Tobias.Hartnick [] from Karlsruhe Institute of Technology and Ralf Köhl [] from Justus-Liebig-Universität Gießen.


The seminar is supported by RTG 2229 ''Asymptotic Invariants and Limits of Groups and Spaces''. 

 and by SPP 2026: Geometry at infinity.