Tee-Seminar der AG KramerZeit und Ort:
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Inhalt:
Mitglieder der Arbeitsgruppe und Gäste tragen über ihre laufenden Forschungsarbeiten vor, oder über Themen, die uns interessieren. Vor dem Seminar (ab 10:00) gibt es in Zimmer 301b Tee.
Vorträge:
21.10.14
Rupert McCallum (Münster) Topological rigidity of totally disconnected locally compact groups
Abstract : There are two possible ways to prove that an absolutely quasi-simple algebraic group over a non-archimedean local field admits exactly one locally compact sigma-compact Hausdorff topology compatible with the group operations. One is by proving the result for all locally compact sigma-compact totally disconnected topological groups that are locally finitely generated and locally have finite abelianisation. Another way is by proving that closed Weyl transitive groups of automorphisms of a regular locally finite building have the topological rigidity property in question. We present both of these arguments.
20.11.14
Olga Varghese (Münster) Wirkungen von Aut(F_n) auf CAT(0) Räume, SR0, 12 Uhr.
25.11.14
Koen Struyve (Ghent) Free constructions for geometries of Coxeter type
Abstract :in 1981, Jacques Tits remarked that one can use free constructions to obtain geometries for Coxeter diagrams not containing any subdiagram of type A_3. This result however remained unpublished.
In this talk I will both give an introduction to this topic, and sketch a free construction for these geometries.