Updates:
Cc: asmeurer [email protected]
Comment #4 on issue 2213 by [email protected]: Derivative of Sum
http://code.google.com/p/sympy/issues/detail?id=2213
I think this has been corrected,
In [4]: Sum(f(x), (x, 1, n)).diff(x)
Out[4]: 0
This either needs to be closed, or updated.
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