Comment #8 on issue 2238 by asmeurer: Autodetection of dependent variable in dsolve, checkodesol and other high level function in ODE module
http://code.google.com/p/sympy/issues/detail?id=2238
Yes, you are right, this is a bug in master (I didn't realize that). It should be fixed to work without any calls to .doit() (so we can potentially take advantage of "factorized" input form of an ODE, like Derivative(f(x) + x, x, x, x)).
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