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Jul 15, 2012 at 15:55 comment added Mirco A. Mannucci The question was trivial after all. But anyway, your proof is still beautiful: very simple and very elegant: Kudos Qiaochu! PS Do you know if those subgroups play any role whatever aside musical tuning?
Jul 15, 2012 at 15:51 vote accept Mirco A. Mannucci
Jul 15, 2012 at 0:41 history answered Qiaochu Yuan CC BY-SA 3.0