Updates:
Cc: ronan.l...@gmail.com
Comment #7 on issue 3059 by asmeu...@gmail.com: (x - oo).has(oo) is False;
(x - oo).subs(oo, 1) fails
http://code.google.com/p/sympy/issues/detail?id=3059
Ah, I guess then it wouldn't be able to be a singleton, unless we add some
special handling to Mul.flatten.
Ronan, what do you think?
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