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when toggle format what by license comment
Jul 8, 2015 at 6:56 vote accept Dominic van der Zypen
Jul 7, 2015 at 11:15 comment added Bjørn Kjos-Hanssen mathoverflow.net/questions/201547/…
Jul 7, 2015 at 10:56 history answered Eric Wofsey CC BY-SA 3.0