Comment #10 on issue 2389 by asmeurer: Semantic inconsistency between Basic.__contains__ and Tuple.__contains__
http://code.google.com/p/sympy/issues/detail?id=2389
That's a good point. I agree then that we should remove __contains__, except where it explicitly makes sense, like with Interval and Tuple. Things like "x in x*y" would raise TypeError (like "1 in 2").
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