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Jul 27, 2016 at 15:08 comment added Stanley Yao Xiao Is there a classification as to which group is realized, and when?
Jun 12, 2013 at 19:11 comment added MRD1729 This is interesting: I wasn't aware of the Conway topograph (I've since hunted down a copy of 'The Sensual Quadratic Form'). Thank you.
Jun 12, 2013 at 19:08 vote accept MRD1729
Jun 12, 2013 at 3:50 history answered Allen Hatcher CC BY-SA 3.0