BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VTIMEZONE
TZID:Europe/Vienna
BEGIN:DAYLIGHT
DTSTART:20170326T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZNAME:CEST
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20171029T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZNAME:CET
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTAMP:20260428T045813Z
UID:587ce58024563796576808@ist.ac.at
DTSTART:20170503T134500
DTEND:20170503T154500
DESCRIPTION:Speaker: Kevin McGerty\nhosted by Tamas Hausel\nAbstract: A cla
 ssical result of Kirwan proves that cohomology ring of a quotient stack su
 rjects onto the cohomology of an associated GIT quotient via the natural r
 estriction map. In many cases the cohomology of the quotient stack is easy
  to compute so this often yields\, for example\, generators for the cohomo
 logy ring of the GIT quotient. In the symplectic case\, it is natural to a
 sk whether a similar result holds for (algebraic) symplectic quotients. Al
 though this surjectivity is thought to fail in general\, it is expected to
  hold in many cases of interest. In recent work with Tom Nevins (UIUC) we 
 establish this surjectivity result for Nakajima's quiver varieties. An imp
 ortant role is played by a new compactification of quiver varieties which 
 arises from the study of graded representations of the preprojective algeb
 ra.\n
LOCATION:Seminar room Big Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:jdeanton@ist.ac.at
SUMMARY:Kevin McGerty: Kirwan surjectivity for quiver varieties
URL:https://talks-calendar.ista.ac.at/events/580
END:VEVENT
END:VCALENDAR