GGT Seminar
This is the hub of our research group. The place where we talk about math and all the things interesting to us.
The seminar consists mostly of presentations by the group members, with occasional talks by guests. People external to the group are also welcome to attend!
We meet weekly on Wednesdays at 11:15, in SR 8.
Winter 2025
- 21. 1. 2026 Yuriy Tumarkin (Zürich) - tba
- 14. 1. 2026 Marius Streiff - Conjugacy problem in T-RAAGs
- 3. 12. Sebastian Bischof (Paderborn) - tba
- 12. 11. Kevin Klinge and Raphael Appenzeller - Cops and Robbers
- 5. 11. Paul Vollrath (Weizmann institute, Rehovot) - Spherical Buildings as Expanders: Asymptotics of Laplacian-type Operators
- 29. 10. Erick Gordillo - Mixing translation flows and Rokhlin's problem
Summer 2025
- 24.07 Petra Schwer - Conjugator length of locally compact groups of Euclidean isometries
- 17.07 Kevin Li (Regensburg) - A combination theorem for homological properties of groups
- 10.07 Antoine Cuvelier (ENS Paris) - On the saddle connection graph of the golden L
- 03.07 Leon Pernak (Saarbrücken) - Quadratic equations in wreath products of abelian groups
- 26.05 Yuri Santos Rego (Lincoln) - Locally compact Artin groups and their finiteness properties
- 22.05 Julien Boulanger (Santiago de Chile) - Connection points on translation surfaces
- 15.05 José Pedro Quintanilha - Counting chambers in the noncrossing partition complex
- 08.05 Raphael Appenzeller - Arxivology: "Characterization of higher rank via affine maps"
Winter 2024 / 25
- 30.01 Asif Shaikh (Frankfurt) - Cogrowth in Free Groups
- 23.01 Petra Schwer - Conjugation in split Euclidean Isometry groups
- 16.01 Marco Lotz - Unbounded reflection length and conjugacy
- 19.12 Raphael Appenzeller - Playing cops and robbers on Cayley graphs - connections to hyperbolicity
- 12.12 Bianca Marchionna - Invariants and zeta functions for totally disconnected locally compact groups
- 03.12 Isobel Davies - Complete CAT(0) Spaces with Apartment Systems
- 28.11 Dorian Chanfi (Gießen) - Polyhedral compactifications of Bruhat-Tits buildings
- 21.11 Raphael Appenzeller - What is an affine Lambda-building?
- 14.11 Maurice Reichert - Geometric Invariants and Asymptotics of Translation Surfaces
- 07.11 Bianca Marchionna - Tree structures on non-affine buildings
- 24.10 José Pedro Quintanilha - What is a quandle?
- 10.10 Marco Lotz - Reflection length in infinite non-affine Coxeter groups
Summer 2024
- 18.07 Hamid Al-Saqban (Paderborn) - On the Unique Ergodicity for Foliations of Generic Abelian Differentials
- 04.07 Carsten Peterson (Paderborn) - Degenerate Brion's formula and applications to symmetric spaces and affine buildings
- 27.06 Matthias Uschold (Regensburg) - Mapping degree sets between manifolds
- 20.06 Johannes Rau (Bogotá) - Real algebraic varieties close to non-singular tropical limits
- 13.06 Sira Busch (Münster) - Projectivity Groups of Spherical Buildings
- 16.05 Raphael Appenzeller (ETH Zürich) - Bridges between affine buildings and symmetric spaces
- 15.04 Valentin Ovsienko (Reims) - q-deformed numbers: geometry and combinatorics
Last update on Nov 3, 2025 at 10:48 UTC
