BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//132.216.98.100//NONSGML kigkonsult.se iCalcreator 2.20.4//
BEGIN:VEVENT
UID:20251122T222150EST-9411X4fDXM@132.216.98.100
DTSTAMP:20251123T032150Z
DESCRIPTION:Title: The boundary rigidity of lattices in products of trees\n
 \nAbstract: Each complete CAT(0) space has an associated topological space
 \, called /visual boundary/ that coincides with the /Gromov boundary/ in c
 ase that the space is hyperbolic. A CAT(0) group $G$ is called /boundary r
 igid/ if the visual boundaries of all CAT(0) spaces admitting a geometric 
 action by G are homeomorphic. If $G$ is hyperbolic\, $G$ is boundary rigid
 . If G is not hyperbolic\, G is not always boundary rigid. The first such 
 example was found by Croke-Kleiner.\n\nIn this talk we will see that every
  torsion-free group acting geometrically a product of n regular trees of f
 inite valence is boundary rigid. That means that every CAT(0) space that a
 dmits a geometric action of any such group has the boundary homeomorphic t
 o a join of n copies of the Cantor set. This is joint work with Kasia Jank
 iewicz\, Kim Ruane\, and Bakul Sathaye.\n\nWe hope you all had an enjoyabl
 e summer and look forward to seeing everyone on Wednesday.\n
DTSTART:20220907T190000Z
DTEND:20220907T200000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Annette Karrer (ɬÀï·¬)
URL:/mathstat/channels/event/annette-karrer-mcgill-uni
 versity-341079
END:VEVENT
END:VCALENDAR