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UID:20260610T194420EDT-0238Cnv0Vh@132.216.98.100
DTSTAMP:20260610T234420Z
DESCRIPTION:Title: Hyperfiniteness of boundary actions of graphical small c
 ancellation groups\n\nAbstract: Given a Gromov hyperbolic space equipped w
 ith an action of a group by isometries\, one can study the orbit equivalen
 ce relation of the induced action of the group on the Gromov boundary of t
 he space. Marquis and Sabok proved that the action of hyperbolic groups on
  their Gromov boundaries turns out to have the property that the orbits ca
 n be arranged into lines in a consistent manner\, a property known as hype
 rfiniteness. We show that (infinitely presented) graphical small cancellat
 ion groups exhibit a similar phenomenon\, inducing hyperfinite orbit equiv
 alence relations on the boundaries of their natural hyperbolic Cayley grap
 hs. This is joint work with Damian Osajda and Koichi Oyakawa.\n\nWe will g
 ather for teatime in the lounge after the talk.\n
DTSTART:20250219T210000Z
DTEND:20250219T220000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Chris Karpinski (McGill)
URL:https://www.mcgill.ca/mathstat/channels/event/chris-karpinski-mcgill-36
 3686
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