Comment #29 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
OK, that is evidence enough for me. And this would assumedly extend to diff(f(x), x, n).diff(diff(f(x), x, m)) == delta(n, m), where n and m are nonnegative integers.
Maybe we are mixing partial and total derivatives?
This is a good point. So diff should always be a partial derivative? Maybe we need a total_diff() function.
Anyway, it too should be added to the documentation. -- You received this message because you are subscribed to the Google Groups "sympy-patches" group. To post to this group, send email to sympy-patches@googlegroups.com. To unsubscribe from this group, send email to sympy-patches+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy-patches?hl=en.
