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Jul 8, 2010 at 8:33 comment added Brad Rodgers This certainly 'smells' like the right reduction to make! My suspicion is that from here one has to group the remaining terms in the right way (as opposed to considering them in isolation) to get a nice identity, but I haven't been able to see how to do it yet...
Jul 6, 2010 at 23:08 history answered David E Speyer CC BY-SA 2.5