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UID:20250719T214034EDT-0161vCO1tt@132.216.98.100
DTSTAMP:20250720T014034Z
DESCRIPTION:Title: Helly groups\n\nAbstract:\n\nA graph is Helly if every f
 amily of pairwise intersecting (combinatorial) balls has common intersecti
 on. Groups acting geometrically - that is\, properly and cocompactly - on 
 Helly graphs are themselves called Helly. Such graphs and groups possess v
 arious non-positive-curvature-like features. Moreover\, Helly graphs are c
 losely related to injective metric spaces\, whose behavior is very similar
  to CAT(0) spaces\, and Helly groups act geometrically on injective metric
  spaces as well. In the talk I will overview main examples of Helly groups
  and their important properties.\n\nThe talk is based on works with Jeremi
 e Chalopin\, Victor Chepoi\, Anthony Genevois\, Hiroshi Hirai\, and Jingyi
 n Huang.\n
DTSTART:20200122T200000Z
DTEND:20200122T210000Z
LOCATION:BURN 1104\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue
  Sherbrooke Ouest
SUMMARY:Damian Osajda (University of Wrocław)
URL:/mathstat/channels/event/damian-osajda-university-
 wroclaw-310165
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