Comment #3 on issue 3585 by [email protected]: Replace new assumptions
handlers
http://code.google.com/p/sympy/issues/detail?id=3585
There's also issue 1047.
In the end, I think the main issue with the old assumptions is that they
are tied into the core, which made it harder to extend, and, more
importantly, slow. Additionally, the property model (obj.is_assumption) is
not expressive enough to represent complex assumptions, such as assumptions
on expressions. So the new system kept everything separate from the core.
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