Comment #24 on issue 1816 by [email protected]: Adding partial derivatives and taking derivatives with respect to functions
http://code.google.com/p/sympy/issues/detail?id=1816
If we're talking about elementary calculus, then deriving wrt a function doesn't make sense. We already have a sound way of representing f'(g(x)), why should we replace it with something that's full of ambiguities? The chain rule is just a notational trick that is visually appealing because it gives the same name to unrelated objects. In df/dg * dg/dx, the first g is just a variable while the second is a previously defined function named "g".
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