Comment #1 on issue 3059 by [email protected]: (x - oo).has(oo) is False http://code.google.com/p/sympy/issues/detail?id=3059
It's for a similar reason that (-(x + 1)).has(x + 1) is False. I guess the has docstring should be more explicit that the matching is exact (structurally).
Is there an alternative that would be smarter? There was talk about find() once, I think. Maybe something like that could be more intelligent.
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