Comment #17 on issue 1620 by [email protected]: Allow derivatives of unknown functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
Using D as operator is well in the line of issue 1688. It's necessary that somehow f and D(f) to be callable objects of the same "kind", but I don't know how to do this the way things are right now. Depending on Ronan's answer, it may be the best approach.
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