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CATEGORIES:Algebra seminar
SUMMARY:Median spaces\, properties (T) and Haagerup\, appl
ications to mapping class groups - Cornelia Drutu\
, University of Oxford
DTSTART:20091015T150000Z
DTEND:20091015T160000Z
UID:TALK106AT
URL:/talk/index/106
DESCRIPTION:The median structure is a metric structure general
izing the one of tree. Both Kazhdan's property (T)
and Haagerup's property can be formulated in term
s of actions of groups on median spaces. Moreover\
, it turns out that every mapping class group of a
surface has a natural equivariant asymptotic stru
cture of median\nspace. This allows to study homom
orphisms into mapping class groups of surfaces\, u
p to conjugation. The talk is on joint work with I
. Chatterji and F. Haglund\, and with J. Behrstock
and M. Sapir.
LOCATION:Watson Building\, Lecture Room A
CONTACT:Simon Goodwin
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