Comment #2 on issue 2238 by [email protected]: 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, it is exactly how it works.
Derivative(x+f(x),x) it is bad surprise. I thought it is automatically
reduced to 1+f(x) like in case (x+f(x)).diff(x) or diff(x+f(x)).
So is it supposed that f(x) is dependent variable or it is x+f(x)?
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