Prof. S. Friedl PhD / Prof. Dr. C. Löh

In this seminar we will cover various topics in topology and geometric group theory.


In SS 2020: We will meet on Thursday, 10:15--11:45, in M201. In WS 2019/20: We will meet on Fridays, 10:15--11:45, in M201.

Scheduled meetings/talks in WS 2019/20

Date Topic Speaker
October 18 Let X be a scheme ... Johannes Witzig
October 25 Classifying spaces and orbit categories Daniel Echtler
November 1 holiday
November 8 Descriptive set theory and forcing Kristin Geßler
November 15 The l^1-semi-norm on singular homology in degree 2 Stephanie Ortmann
November 22 Split-braid-merge diagrams, 3-manifolds, and conjugacy in a braided Thompson group Yuri Santos Rego (OvGU Magdeburg)
November 29 Higer order intersection numbers in 4-manifolds Lars Munser
December 6 no talk (Bavarian Geometry and Topology Meeting, Augsburg) --
December 13 More intersection numbers Lars Munser
December 20
January 10 The uniform boundary condition on free groups Simon Lang
January 17 The Cimasoni-Florens signatures of links Andreas Wicher
January 24 The maximum volume of hyperbolic polyhedra (in M311!) Giulio Belletti (Scuola Normale Superiore, Pisa)
January 31 Homological algebra for l^1-homology Florian Greindl
February 7 Chromatische Zahl von Kneser-Graphen und Borsuk-Ulam-Satz Tobias Frey
February 26 (Wed, 10:15) Daniel Grünbaum

Scheduled meetings/talks in SS 2019

Date Topic Speaker
April 26 Prime decomposition of high-dimensional manifolds Stefan Friedl
May 3 Discrete Morse theory Michał Marcinkowski (Wrocław)
May 10 no talk, but there is an extra talk on May 16 (see below)
May 16 14:30--15:30, M104; Whitney towers and higher order intersection numbers Lars Munser (Bonn)
May 17 Excision (from a different viewpoint) Johannes Witzig
May 23 15:00--16:00, M104; Homology operations of little 2-cubes algebras Domenico Marasco (Bonn)
May 24 Introduction to sl_3 homology of knots Carlo Collari ()
May 31 The Reidemeister-Schreier algorithm Muriel Garcia
June 7 Twist knots and Casson-Gordon invariants Damian Iltgen
June 14 Stable classification of 4-manifolds Benjamin Ruppik (Bonn)
June 21 The table theorem José Pedro Quintanilha
June 28 Excision: The wishlist Johannes Witzig
July 5 Chromatic number of groups (8:25--9:55!) Matthias Uschold
July 12 Hashing via expander graphs Yannick Lautner
July 19 The Svarc-Milnor Lemma Pia Knerich
July 26 On the isomorphism problem for (hyperbolic) one-relator groups Alan Logan (Heriot-Watt University)
August 2 The rendez-vous value of topological spaces Jan-Philipp Zwank

Scheduled meetings/talks in WS 2018/19

Date Topic Speaker
October 19 (M311!) Lower bounds on Dehn functions of residually free groups Claudio LLosa-Isenrich (PSUD)
October 26 Minimal stretch factors in the extended mapping class groups Livio Liechti (IMJ)
November 2 no talk --
November 9 Hilbert spaces over non-archimedean fields Raphael Schmidpeter
November 16 (10:00 s.t.!) Hopf algebras in Galois theory Linda Hu
November 23 Vassiliev invariants via manifold calculus Yuqing Shi (Bonn)
November 30 Lagrangian relations, cobordisms and the Maslov index Enrico Toffoli
December 7 part 2 Enrico Toffoli
December 14 Geometry/Topology meeting in Augsburg
December 21 Bieri-Neumann-Strebel Transchromatic Theory with Quasi Theory Gerrit Herrmann
January 11 Scanning maps (?) Luigi Caputi
January 18 Some faces of the Poincaré homology 3-sphere José Pedro Quintanilha
January 25 Simplicial Poincaré Duality Bruno Mazorra
(additional talk of the seminar Topology vs. Combinatorics)
February 1 tba Alexandra Kjuchukova (MPIM)
February 8 moved to Wed, Feb 6, 14:00 Kai Zehmisch (Gießen)

Scheduled meetings/talks in SS 2018

Date Topic Speaker
April 12 Fibred classes Stefan Friedl
April 19 Homological stability for Artin monoids Rachael Boyd (University of Aberdeen)
April 26 Irrfahrten, Satz von Polya Leonhard Beutlhauser
May 3 Irrfahrten auf 3-Mannigfaltigkeiten Richard Mante
May 10 -- Ascension Day
May 17 Exceptional manifolds Stefan Friedl
May 24 Surgery theory for dummies/beginners Markus Land
May 31 -- Corpus Christi
June 7 Klassifikation von Seifert-gefaserten 3-Mannigfaltigkeiten Felix Eberhart
June 14 10 Reasons why profinite groups are important in the world around you José Pedro Quintanilha
June 21 Der Satz von Helly Julian Hannes
June 28 Configuration spaces of linkages Dennis Zumbil
July 5 A Tale of Three Embeddings of Group Rings Fabian Henneke (Bonn)
July 12 An introduction to machine learning Jonas Kleinöder
July 19 Simplicial volume of surfaces with finite coefficients Michael Friesen


entry in the commented list of all courses.

Last change: November 15, 2019