Comment #3 on issue 2206 by [email protected]: plus-minus object
http://code.google.com/p/sympy/issues/detail?id=2206
+1 on the cool idea. Surprising how its not already there. So should stuff
like limit(x**pm, x, 0) return a 2-tuple, and maybe check to see if the
tuple can again be converted back to a single expr with pm in it.
Sage doesn't have this support. It might be for a reason.
Aaron, pm differs from other symbols because, other symbols are expected to
have ONE value, while pm has two. So we can't treat it as just another
Symbol.
But, I think its worth it, A symbolic mathematics library should have this,
even if the implementation is somewhat non-trivial.
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