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UID:20260914T225926EDT-8252l0HTxv@132.216.98.100
DTSTAMP:20260915T025926Z
DESCRIPTION:Title: Torsion groups do not act on 2-dimensional CAT(0) comple
 xes.\n\nAbstract: We show\, under mild hypotheses\, that if each element o
 f a finitely generated group acting on a 2-dimensional CAT(0) complex has 
 a fixed point\, then the action is trivial. In particular\, all actions of
  finitely generated torsion groups on such complexes are trivial. As an in
 gredient\, we prove that the image of an immersed loop in a graph of girth
  2π with length not commensurable to π has diameter >π. This is related to
  a theorem of Dehn on tiling rectangles by squares. Joint work with Sergey
  Norin and Damian Osajda.\n
DTSTART:20190313T190000Z
DTEND:20190313T200000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Piotr Przytycki (McGill University)
URL:https://www.mcgill.ca/mathstat/channels/event/piotr-przytycki-mcgill-un
 iversity-295340
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