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VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Boundary 2-transitive automorphism groups of trees
DTSTART:20161208T130000
DTEND:20161208T140000
DTSTAMP:20261005T021849Z
UID:4364cdb9530247c3b3fdb48e55542636184dc6853735d5ad6d38b0dd
CATEGORIES:Conferences - Seminars
DESCRIPTION:Nicolas Radu\nLet T be a locally finite tree all of whose vert
 ices have valency at least 6. In this talk\, we will be interested in clos
 ed subgroups of Aut(T) acting 2-transitively on the set of ends of T and w
 hose local action at each vertex contains the alternating group. The main 
 result I will present is a full classification of these groups\, up to iso
 morphism. The outcome of the classification is a countable family of group
 \, most of which are new\, and all containing a simple subgroup of index 
 ≤ 8. I will also explain what makes the assumption of 2-transitivity on 
 the boundary natural and discuss some direct consequences of the result.
LOCATION:MA 31
STATUS:CONFIRMED
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