Updates:
Cc: elliso...@gmail.com renato.c...@gmail.com
Labels: -Type-Defect -Priority-Medium Type-Enhancement Priority-High
NeedsReview
Blockedon: 1654
Comment #3 on issue 1816 by asmeurer: Adding partial derivatives and taking
derivatives with respect to functions
http://code.google.com/p/sympy/issues/detail?id=1816
See https://github.com/sympy/sympy/pull/460 and the discussion there. As
suggested on that pull request, I'm moving the discussion here (see the
discussion there for context for what I write below).
I agree about Atom/AtomicExpr. I think the only atoms that make sense in
this context are Symbols.
I think the _diff_wrt is a good workaround.
I guess we should just have a disclaimer that a certain level of
independence is assumed when differentiating with respect to a function or
derivative (I'm not sure how to express this formally). In other words, we
have to assume stuff like f(2*x).diff(f(x)) == 0.
Brian, did you see if we will have to fix issue 1654?
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