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Spring Semester 2025

Date / Time Speaker Title Location
19 March 2025
15:30-16:30 		Raphael Appenzeller
Universität Heidelberg
Details

Geometry Seminar

Title Characterizing hyperbolicity via game theory
Speaker, Affiliation Raphael Appenzeller, Universität Heidelberg
Date, Time 19 March 2025, 15:30-16:30
Location HG G 43
Abstract The cop numbers are two new integer-valued invariants of finitely generated groups defined in terms of a two player pursuit game played on Cayley graphs. We use the cop numbers to give a new characterization of hyperbolic groups and virtually free groups. We discuss potential applications and recent progress on remaining open questions. This is joint work with Kevin Klinge.
Characterizing hyperbolicity via game theoryread_more
HG G 43
26 March 2025
15:30-16:30 		Yash Lodha
University of Hawaii at Manoa
Details

Geometry Seminar

Title Two new constructions of finitely presented infinite simple groups
Speaker, Affiliation Yash Lodha, University of Hawaii at Manoa
Date, Time 26 March 2025, 15:30-16:30
Location HG G 43
Abstract I will describe two new constructions of finitely presented infinite simple groups. First, I will present a construction of finitely presented (and type F∞) simple groups that act by orientation preserving homeomorphisms on the real line. These are the first such examples. Next, I will present a construction of a family of finitely presented infinite uniformly simple groups, where the Ulam width can get arbitrarily large. Among the class of finitely generated (but not finitely presentable) groups, the existence of such examples was demonstrated in the work of Ivanov from 1989. Our construction provides the first such family of examples in the class of infinite finitely presented groups. This is joint work with James Hyde.
Two new constructions of finitely presented infinite simple groupsread_more
HG G 43
2 April 2025
15:30-16:30 		Leonid Monin
EPFL
Details

Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Leonid Monin, EPFL
Date, Time 2 April 2025, 15:30-16:30
Location HG G 43
Title T.B.A.
HG G 43
9 April 2025
15:30-16:30 		Anthony Genevois
Institut Montpellierain Alexander Grothendieck
Details

Geometry Seminar

Title Quasi-median graphs, right-angled Artin groups, and homotopy
Speaker, Affiliation Anthony Genevois, Institut Montpellierain Alexander Grothendieck
Date, Time 9 April 2025, 15:30-16:30
Location HG G 43
Abstract After a general introduction to applications of metric graph theory in geometric group theory, focused on quasi-median graphs, I will explain how one can deduce from such a perspective new quasi-isometric invariants for right-angled Artin groups. This is joint work with Carolyn Abbott and Eduardo Martinez-Pedrosa.
Quasi-median graphs, right-angled Artin groups, and homotopyread_more
HG G 43
16 April 2025
15:30-16:30 		Jeremy Tyson
University of Illinois Urbana-Champaign
Details

Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Jeremy Tyson, University of Illinois Urbana-Champaign
Date, Time 16 April 2025, 15:30-16:30
Location HG G 43
Title T.B.A.
HG G 43
7 May 2025
15:30-16:30 		Hugo Parlier
Université de Fribourg
Details

Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Hugo Parlier, Université de Fribourg
Date, Time 7 May 2025, 15:30-16:30
Location HG G 43
Title T.B.A.
HG G 43
14 May 2025
15:30-16:30 		Stefanie Zbinden
Heriot-Watt University
Details

Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Stefanie Zbinden, Heriot-Watt University
Date, Time 14 May 2025, 15:30-16:30
Location HG G 43
Title T.B.A.
HG G 43
21 May 2025
15:30-16:30 		Paula Truöl
MPIM Bonn
Details

Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Paula Truöl, MPIM Bonn
Date, Time 21 May 2025, 15:30-16:30
Location HG G 43
Title T.B.A.
HG G 43
28 May 2025
15:30-16:30 		Livio Liechti
Université de Fribourg
Details

Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Livio Liechti, Université de Fribourg
Date, Time 28 May 2025, 15:30-16:30
Location HG G 43
Title T.B.A.
HG G 43

Notes: the highlighted event marks the next occurring event.

Organisers: Manfred Einsiedler, Urs Lang, Lukas Lewark, Christian Urech

Archive: SS 25 AS 24 SS 24 AS 23 SS 23 AS 22 SS 22 AS 21 AS 20 SS 20 AS 19 SS 19 AS 18 SS 18 AS 17 SS 17 AS 16 SS 16 AS 15 SS 15 AS 14 SS 14 AS 13 SS 13 AS 12 SS 12 AS 11 SS 11 AS 10 SS 10 AS 09 SS 09