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SUMMARY:Coherent group actions on the real line or an interval
DTSTART:20180503T130000
DTEND:20180503T140000
DTSTAMP:20260928T200406Z
UID:c467d967558f07ae3d25e02bad34b276789c266f167647929b45fcf2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Yash Lodha\nThe subgroup structure of Thompson's group F is 
 quite mysterious \n\nand several recent papers (for instance those of Go
 lan\, Sapir and Brin\, Bleak\, Moore) \n\nhave been devoted to developing
  a systematic structure theory of subgroups of F.\n\nOne related prominen
 t result is due to Vaughan Jones\, \n\nwho showed that a specific subg
 roup of F encodes all oriented knots in a natural manner.\n\n \n\nIn thi
 s talk I will introduce a class of actions on the real line or an interval
 \,\n\nwhich provides a systematic framework for proving non embeddabilit
 y results\n\nfor Thompson's group F and generalisations.\n\nThe class of a
 ctions (and the underlying class of groups which admit such actions) \n\n
 is interesting even for its own sake\, and one can draw \n\ncertain algeb
 raic conclusions\, and some concerning rigidity of the action\, \n\nfro
 m a fairly simple set of dynamical axioms.
LOCATION:MA A3 30 https://plan.epfl.ch/?room=MAA330
STATUS:CONFIRMED
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