Comment #9 on issue 3059 by ronan.l...@gmail.com: (x - oo).has(oo) is False; (x - oo).subs(oo, 1) fails
http://code.google.com/p/sympy/issues/detail?id=3059
* Getting rid of NegativeInfinity would simplify a few things and avoid some duplication, so it's probably a good idea.
* Code that assumes that the product of two Numbers is a Number is wrong: there are many counter-examples such as pi*pi or 2*E.
* If you want to define S.NegativeInfinity for backwards compatibility, you can do it at the bottom of numbers.py, just after the line "Mul.identity = One()".
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