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Dec 29, 2016 at 13:29 comment added Ali Taghavi Prof. Bryant Thank you very much for this very interesting answer.
Dec 29, 2016 at 13:24 vote accept Ali Taghavi
Dec 29, 2016 at 12:20 history edited Robert Bryant CC BY-SA 3.0
added 508 characters in body
Dec 29, 2016 at 9:46 history answered Robert Bryant CC BY-SA 3.0