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Jul 12, 2015 at 16:55 history bounty ended Ali Taghavi
Jul 7, 2015 at 13:56 comment added Ali Taghavi thank you very much for your interesting answer. I try to learn it.
Jul 6, 2015 at 12:50 comment added Paul Siegel I suppose this is actually quite similar to Yuri Bakhtin's answer, but perhaps the added focus on index theory will be helpful.
Jul 6, 2015 at 12:42 history answered Paul Siegel CC BY-SA 3.0