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SUMMARY:Yves Stadler (Université Clermont Auvergne)
DTSTART:20210621T063000Z
DTEND:20210621T073000Z
DTSTAMP:20260423T021353Z
UID:SiN/23
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SiN/23/">Hig
 hly transitive groups among groups acting on trees</a>\nby Yves Stadler (U
 niversité Clermont Auvergne) as part of Symmetry in Newcastle\n\n\nAbstra
 ct\nHighly transitive groups\, i.e. groups admitting an embedding in Sym(N
 ) with dense image\, form a wide class of groups. For instance\, M. Hull a
 nd D. Osin proved that it contains all countable acylindrically hyperbolic
  groups with trivial finite radical. After an introduction to high transit
 iviy\, I will present a theorem (from joint work with P. Fima\, F. Le Maî
 tre and S. Moon) showing that many groups acting on trees are highly trans
 itive. On the one hand\, this theorem gives new examples of highly transit
 ive groups. On the other hand\, it is sharp because of results by A. Le Bo
 udec and N. Matte Bon.\n
LOCATION:https://researchseminars.org/talk/SiN/23/
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