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UID:20251122T111733EST-6533XTknEn@132.216.98.100
DTSTAMP:20251122T161733Z
DESCRIPTION:Extremal panels and taco moves.\n\nThere are various interestin
 g statements that boil down to passing from an action of a group G on a CA
 T(0) cube complex to an action on a tree. These include Stallings' ends th
 eorem\, the Nielsen realisation theorem for Out(F_n)\, and the Kropholler-
 Roller conjecture about almost-invariant subsets. I will discuss a method 
 for converting a G-action on a CAT(0) cube complex X to a G-action on a 'l
 ower complexity' CAT(0) cube complex Y and describe conditions under which
  this can be used inductively to find a splitting of G. This leads to new 
 proofs of the first two of the preceding statements\, as well as a special
  case of the Kropholler-Roller conjecture. I will also briefly describe so
 me possible generalisations of the construction. Most of this talk is on j
 oint work with Nicholas Touikan\; it will also touch on some joint work wi
 th Henry Wilton.\n
DTSTART:20180131T200000Z
DTEND:20180131T210000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Mark Hagen\, University of Bristol
URL:/mathstat/channels/event/mark-hagen-university-bri
 stol-284248
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