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UID:20260916T115626EDT-8759kMho9g@132.216.98.100
DTSTAMP:20260916T155626Z
DESCRIPTION:Title: The conjugacy problem for Dehn twist automorphisms of gr
 oups\n\nAbstract: A Dehn twist automorphism of an arbitrary group is an al
 gebraic generalization of a Dehn twist homeomorphism of a surface\, define
 d in terms of a graph-of-groups decomposition of the group. Cohen and Lust
 ig developed an algorithm to solve the conjugacy problem for Dehn twists o
 f non-abelian free groups. We generalize the results of Cohen-Lustig to fr
 ee products of finitely generated free abelian groups. Our main tool is th
 e construction of a canonical (acylindrical) graph-of-groups decomposition
  of the mapping torus of the Dehn twist automorphism. This is joint work w
 ith Bratati Som and Amir Weiss.\n\nWe will gather in the lounge for teatim
 e after the talk.\n
DTSTART:20260128T210000Z
DTEND:20260128T220000Z
LOCATION:Room 1104\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue
  Sherbrooke Ouest
SUMMARY:Chris Karpinski (McGill University)
URL:https://www.mcgill.ca/mathstat/channels/event/chris-karpinski-mcgill-un
 iversity-370576
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