Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium Concrete WrongResult
New issue 3868 by [email protected]: Derivative wrt Function in Sum gives
wrong result
http://code.google.com/p/sympy/issues/detail?id=3868
In [5]: z_i = Function('z')(i)
In [6]: q_i = Function('q')(i)
In [7]: a_k = Sum(-q_i*z_i/k,(i,1,m))
In [8]: print a_k.diff(z_i)
0
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