Comment #23 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
"The issue topic looks more like a simple partial derivative, as is very
commonly used in mechanic"
Yes, exactly! I have tried to say this repeatedly, and I don't know how to
say it more clearly: the functional derivatives I have implemented are just
simple partial derivatives, exactly the ones you see in intro calculus
classes when things like the chain rule are covered:
http://mathworld.wolfram.com/ChainRule.html
You can't even write down the familiar forms of the chain rule without
accepting this basic interpretation of derivatives wrt functions. And
derivatives wrt known functions like sin/cos/exp are no different than any
others. My implementation *does* have a number of problems that I will
fix, but in my mind, there should be no confusion about what the goal of
the implementation is.
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