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Mar 31, 2016 at 15:28 review Low quality posts
Mar 31, 2016 at 16:33
Apr 3, 2010 at 13:17 comment added David E Speyer This answer, on the other hand, is wrong. Your answer should be a nontrivial cohomology class.
Apr 3, 2010 at 11:24 history answered transvectant CC BY-SA 2.5