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Jan 2, 2014 at 20:00 vote accept Qiaochu Yuan
Dec 17, 2013 at 21:37 comment added Will Sawin 1. I got this from reading the same reference as Ulrich, but I too do not remember explicitly where it is in that reference. 2. The cup product shows up in that the representations of all these groups should preserve the ring structure by their respective definitions.
Dec 17, 2013 at 21:30 history answered Will Sawin CC BY-SA 3.0