Comment #15 on issue 1654 by [email protected]: subs() doesn't substitute lower derivatives into higher order ones
http://code.google.com/p/sympy/issues/detail?id=1654
I went ahead and fixed the issue the way described above: https://github.com/renatocoutinho/sympy/tree/1654
But checkodesol and integrate didn't like this at all. The former throwed several errors, while the latter gives integrate(Derivative(f(x), x), x) == x*D(f(x), x).
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