Comment #6 on issue 2430 by [email protected]: Expression Countable Set
http://code.google.com/p/sympy/issues/detail?id=2430
-- Why is N._inf == -oo and N._sup == 0?
this is just a typo
-- So you are using the definition of natural numbers that includes 0?
Yes although I think I decided this with a coin flip while I was writing
the code.
-- Labels
No particular preference. I'm not planning to do extensive work with sets
in the near future if that's the question.
In general this code was just me playing to see how feasible this idea was.
I posted it to this issue to gather comments and suggestions for other ways
to do things.
One problem I'm running into is rules for intersection. The _intersection
methods are starting to include all possible interactions, i.e.
if other.is_Interval: ...
if other.is_FiniteSet: ...
if other.is_Union: ...
This is becoming troublesome.
Also, where should fancysets.py live? I don't think it belongs in the core.
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