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SUMMARY:Deforming group actions on curves in positive characteristic
DTSTART:20150312T141500
DTEND:20150312T151500
DTSTAMP:20260406T142559Z
UID:033ec78740f757e909dc82dc6b9efb82e168507321df7b5162d2fce8
CATEGORIES:Conferences - Seminars
DESCRIPTION:Jakub Byszewski - Institute of Mathematics of the Jagiellonian
  University\nThe actions of finite groups on curves in positive characteri
 stic can be more complicated than in characteristic zero. For this reason\
 , there are both global and local obstructions to the problem of lifting g
 roup actions on curves to characteristic zero. For example\, the Hurwitz b
 ound on the order of the automorphism group fails in positive characterist
 ic\, and there are also some local obstructions related for example to the
  Artin character associated to ramification points of the quotient map.\nS
 uch problems can be studied in more detail using global and local deformat
 ion functors of finite group actions on curves. These functors are\, again
 \, much more interesting in positive characteristic. In the talk\, we will
  study some properties of such deformation functors.
LOCATION:GR A3 30 http://plan.epfl.ch/?lang=en&room=GR+A3+30
STATUS:CONFIRMED
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