Comment #7 on issue 2430 by [email protected]: Expression Countable Set http://code.google.com/p/sympy/issues/detail?id=2430
Personally, I don't see why any of the sets should be in the core (unless I'm missing some fundamental core use of them). We should have a sets module.
I don't have any thoughts on intersection right now.
Yes although I think I decided this with a coin flip while I was writing the code.
Well, in my experience, {1, 2, 3, ...} is used more often, unless you are talking about mathematical logic and Peano arithmetic. It just boils down to writing N.union({0}) or N - {0} to get the other, though.
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