Comment #39 on issue 821 by asmeurer: multiple arguments for max and other improvements
http://code.google.com/p/sympy/issues/detail?id=821
I forgot about oo. Should it then be just "if (x.is_real is not None) or (x is S.Infinity) or (x is S.NegInfinity)"? We could combine this into an is_comparable assumption, or we could just test those three things wherever it is needed. If it isn't in very many places, probably the second would be better. Another option would be to have some kind of extended reals assumption.
Anyway, I wouldn't waste your time putting it in the old assumptions, so for now, just test as above.
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