Timeline for Are there "reasonable" criteria for existence/non-existence of Levi factors or their conjugacy in prime characteristic?
Current License: CC BY-SA 2.5
9 events
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| Jun 22, 2022 at 7:16 | history | edited | CommunityBot |
replaced http://front.math.ucdavis.edu/ with https://arxiv.org/abs/
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| Apr 13, 2017 at 12:58 | history | edited | CommunityBot |
replaced http://mathoverflow.net/ with https://mathoverflow.net/
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| Jul 23, 2010 at 20:24 | history | edited | George McNinch | CC BY-SA 2.5 |
added 589 characters in body
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| Jul 21, 2010 at 13:09 | vote | accept | Jim Humphreys | ||
| Apr 23, 2010 at 18:20 | history | edited | George McNinch | CC BY-SA 2.5 |
added 13 characters in body
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| Apr 23, 2010 at 15:36 | history | edited | George McNinch | CC BY-SA 2.5 |
Removed waffling about "linearizable"; included implication of H^2 vanishing.
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| Apr 23, 2010 at 14:09 | comment | added | George McNinch | @Jim: right - when I wrote yesterday I couldn't remember "non-linearizable" examples. | |
| Apr 23, 2010 at 12:28 | comment | added | Jim Humphreys | I agree that examples unrelated to Witt vectors might occur. There may even be examples which look entirely artificial, but of course it would be much nicer if instead they all arose naturally in a scheme-theoretic framework. Your last comment is important to keep in mind, since work from about 1989 by Gerry Schwarz and others has made it clear that some reductive group actions on affine space can't be linearized. Anyway, low degree cohomology is a natural tool if one can learn enough about it. | |
| Apr 22, 2010 at 16:00 | history | answered | George McNinch | CC BY-SA 2.5 |