Algebraic Geometry

A room for anyone interested in algebraic geometry and nearby fields (number theory, representation theory, etc).
3208d ago – user66288
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May 8, 2015 04:45
Hmm remind me what at left Kan extension is again
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Jun 3, 2015 17:39
what are the classical applications of coherent cohomology? like what were the applications that made everyone think that FAC was the best paper ever etc.? I can't get much of a sense of this from skimming FAC itself
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May 14, 2015 19:04
(Right now I have the image of you trying to torture the poor Angelo to give you the statement of the theorem :))
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May 14, 2015 18:16
whoa this room is great! i didn't realize it had gotten going again.
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dhy
May 14, 2015 18:11
or else you associate difference noncommutative schemes to a point and to G/G, where G acts by addition
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dhy
Dec 2, 2015 21:14
@user66288: This is going to be true in the specific case you mention (K=Q,H=P intersect Q, P a parabolic) because your map G/H->G/K factors as G/H->G/K x G/P->G/K. The first map is an embedding (and hence projective) and the second map is a product with G/P->pt (and hence projective because G/P is projective.)
Aug 19, 2015 18:19
@pro: Looks pretty awesome to me!
pro
Aug 19, 2015 13:56
I just noticed this paper arxiv.org/abs/1502.07004. Since I am not familiar with point counting or Weil conjecture type stuff, I wanted to ask: how cool and unexpected is this result? To me it seems incredibly interesting, but maybe it's because I am not aware of previous "well-known" results in the field. Any comments?
pro
Jun 6, 2015 08:29
has @QiaochuYuan officially killed the chat?
May 23, 2015 14:57
Wow truly fantastic answers in this thread mathoverflow.net/questions/12814/…
May 14, 2015 19:30
The trick is remembering you're trying to define a category-valued functor, then many definitions that sound weird start to make sense