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when toggle format what by license comment
Jun 20, 2016 at 14:44 comment added Zurab Silagadze @Ali Taghavi never mind. David's answer was great and you accepted it correctly.
Jun 20, 2016 at 13:48 comment added Ali Taghavi Prof Silagadze Thank you very much for your very interesting and perfect answer. (+1). I am sorry that I can not accept more than one answer: meta.mathoverflow.net/questions/1491/…
Jun 20, 2016 at 6:34 history answered Zurab Silagadze CC BY-SA 3.0