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SUMMARY:The borders of Outer space - Karen Vogtmann  (University of Warwic
 k\; Cornell University)
DTSTART:20170623T133000Z
DTEND:20170623T143000Z
UID:TALK73047@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Outer space is an analog for the group Out(F_n) of the symmetr
 ic space associated to an algebraic group.&nbsp\; Motivated by work of Bor
 el and Serre\, Bestvina and  Feighn defined a bordification of Outer space
 \; this is an enlargement of  outer space which is highly-connected at inf
 inity and on which the  action of Out(F_n) extends\, with compact quotient
 . We realize this bordification as a deformation retract of Outer space in
 stead of an  extension.&nbsp\; We use this to give a simpler connectivity 
 proof\, and to  give a description of the boundary nicely analogous to tha
 t of the  Borel-Serre boundary of a symmetric space. This is joint work wi
 th Kai-Uwe Bux and Peter Smillie.<br>
LOCATION:Seminar Room 1\, Newton Institute
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