Comment #12 on issue 1028 by [email protected]: Sum().doit() doesn't do it http://code.google.com/p/sympy/issues/detail?id=1028
I tried the Binomial example I posted and still does not work. I also checked some of the summations that appear on http://en.wikipedia.org/wiki/Summation and the exponential and binomial ones fail. Maybe we should collect a list of common summations and add them. I could start working tomorrow on this issue.
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