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SUMMARY:Small sheaves on large sites - Zhen Lin Low (University of Cambrid
 ge)
DTSTART:20150818T131500Z
DTEND:20150818T141500Z
UID:TALK60426@talks.cam.ac.uk
CONTACT:Zhen Lin Low
DESCRIPTION:It is well known that the category of presheaves (of sets) on 
 a small category is the free cocomplete category generated by the original
  small category\; and restricting to a subcategory of sheaves is like impo
 sing relations on the colimits so generated. Something similar is true for
  large categories\, but one has to be much more careful. I will try to exp
 lain Shulman's conditions for ensuring that the category of small sheaves 
 on a large site satisfy Giraud's axioms for a pretopos.
LOCATION:MR5\, Centre for Mathematical Sciences
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