Updates:
Cc: [email protected]
Comment #2 on issue 3868 by [email protected]: Derivative wrt Function in
Sum gives wrong result
http://code.google.com/p/sympy/issues/detail?id=3868
What's the best way to fix this? xreplace a Dummy when the variable is not
a Symbol? Factor out the free_symbols logic into a helper function that can
also check expressions like Functions? By the way, it looks like Integral
does not have this problem.
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