Comment #5 on issue 3639 by [email protected]: Should we remove old
assumptions?
http://code.google.com/p/sympy/issues/detail?id=3639
It would be nice to remove some of the magic around Symbol.
What will sympy use in general code? What will `is_positive` call? Old
assumptions or new assumptions? There might be some interference if
different parts of sympy use different systems. Assertions made in one
system are unlikely to carry over to the other.
E.g.
x = Symbol('x', positive=True)
print ask(Q.positive(x))
None
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