Comment #1 on issue 1953 by smichr: inconsistency between "in" and "has"
http://code.google.com/p/sympy/issues/detail?id=1953
If you make this change a couple of other problems arise:
f(x).diff(x) is f(x).diff(x)
True
Derivative(f(x),x) is Derivative(f(x),x)
False
I'm not sure what that is happening but it keeps some ode doc tests from
passing.
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