Updates:
Cc: -asmeurer -ronan.l...@gmail.com smi...@gmail.com
Labels: WrongResult
Comment #5 on issue 2213 by asmeurer: Derivative of Sum
http://code.google.com/p/sympy/issues/detail?id=2213
This is now at https://github.com/sympy/sympy/pull/162, I think.
Anyway, 0 is wrong. It should be Sum(f(x).diff(x), (x, 1, n)).
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