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Aug 13, 2012 at 19:27 comment added Deane Yang Yes, thanks! When Jeanne asked me about this, I wanted to suggest using somehow the representation theory of SU(2), but I had no idea how so I didn't say anything. I'm very pleased to see that it really does play a role in answering this question.
Aug 13, 2012 at 18:51 vote accept Jeanne Clelland
Aug 13, 2012 at 18:37 history answered Robert Bryant CC BY-SA 3.0