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Apr 29, 2010 at 4:39 vote accept Tuan
Apr 28, 2010 at 16:39 comment added Tuan yeah, I want to rule that out. I guess I want $\varphi$ to be surjective.
Apr 28, 2010 at 7:35 comment added Torsten Ekedahl A stupid answer is to compose $\pi$ with the zero section of $\overline\pi$, I assume you want to rule that out...
Apr 28, 2010 at 5:48 answer added naf timeline score: 3
Apr 28, 2010 at 4:28 history asked Tuan CC BY-SA 2.5