Updates:
Cc: elliso...@gmail.com
Comment #3 on issue 3928 by asmeu...@gmail.com: Disable diff_wrt on
non-undefined Functions
http://code.google.com/p/sympy/issues/detail?id=3928
Yeah, I know :)
IIRC, I didn't want to do it for defined functions, but I think Brian was
adamant that it should be done that way.
Having diff_wrt only on undefined functions is also problematic,
precisely because it causes them to behave differently from defined
functions.
To me, an undefined function is closer to a Symbol than a function, so I
don't really see any issues with doing it that way (the current class
structure doesn't reflect this, but that's a separate issue).
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