Updates:
Labels: NeedsReview
Comment #28 on issue 1620 by renato.c...@gmail.com: Allow derivatives of
unknown functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
I created the pull request:
https://github.com/sympy/sympy/pull/360
The only things still bugging me about this are pretty printing (low
priority) and this:
Subs(f(x), x, 0) + Subs(f(x), x, 0)
Subs(f(_x), Tuple(_x), Tuple(0)) + Subs(f(_x), Tuple(_x), Tuple(0))
[not 2*Subs(f(_x), Tuple(_x), Tuple(0))]
I don't know how to get around this. BTW, Lambda also acts this way.
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