Comment #1 on issue 2206 by [email protected]: plus-minus object http://code.google.com/p/sympy/issues/detail?id=2206
I think it's probably more trouble than it's worth. You'd have to have to make sure that everything handles correctly expressions that hold two values at once. For instance, what would happen with limit(x**pm, x, 0)? Also, how would you get back from expressions with pm to ordinary expressions, e.g. pm * x -> [x, -x]?
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