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May 19, 2012 at 8:17 comment added Tim Campion For the benefit of anyone else wandering in here: (1) is addressed succinctly at mathoverflow.net/questions/29635/… (where it is also labeled question (1)!). Cf. Mark Hovey's response.
Dec 23, 2011 at 17:33 vote accept Guillaume Brunerie
Dec 23, 2011 at 17:33 comment added Guillaume Brunerie Thanks for all the answers, I'm accepting Jonathan's answer because I was looking for the simplest characterization, but I'll keep in mind the other answers for when I'll need to use this kind of result.
Dec 22, 2011 at 17:58 answer added Mike Shulman timeline score: 5
Dec 22, 2011 at 16:07 answer added David White timeline score: 3
Dec 22, 2011 at 14:22 answer added Charles Rezk timeline score: 12
Dec 22, 2011 at 13:48 answer added Jonathan Chiche timeline score: 7
Dec 22, 2011 at 12:20 history asked Guillaume Brunerie CC BY-SA 3.0