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Apr 3, 2014 at 2:51 vote accept CommunityBot
Oct 27, 2013 at 6:33 vote accept CommunityBot
Mar 11, 2014 at 3:50
Oct 27, 2013 at 6:23 comment added user11863 I found a proof in Switzer's Algebraic Topology book (proposition 2.25)
Oct 27, 2013 at 6:22 vote accept CommunityBot
Oct 27, 2013 at 6:33
Sep 25, 2013 at 7:52 history edited Martin Brandenburg CC BY-SA 3.0
added 372 characters in body
Sep 24, 2013 at 13:50 comment added Chris Heunen In the standard argument, 1. follows from 2.
Sep 24, 2013 at 9:29 history edited Martin Brandenburg CC BY-SA 3.0
added 190 characters in body
Sep 24, 2013 at 9:22 history answered Martin Brandenburg CC BY-SA 3.0