Comment #1 on issue 2068 by smichr: integrate(Integral(f(x), x), x) fails
http://code.google.com/p/sympy/issues/detail?id=2068
I don't recall that it's been made an official issue. Since Tuple knows how
to answer "has", if Integral had it's args wrapped in a Tuple it would work:
Tuple(None, x).has(x)
True
Tuple(None, x).has(y)
False
I think the candidates are Lambda, Sum, Integral, Derivative, and Logic.
Geometrical entities don't implement an args method so they don't have the
problem.
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