Updates:
Status: Fixed
Labels: -NeedsBetterPatch
Comment #4 on issue 1585 by ronan.l...@gmail.com: expression expanded
indiscriminantly
http://code.google.com/p/sympy/issues/detail?id=1585
This works now.
In [25]: eq=(x/neg)**-S.Half; str(eq)
Out[25]: 1/((-x)**(1/2)*(-1/neg)**(1/2))
In [26]: N(eq.subs({x:-2,neg:-3}))
Out[26]: 1.22474487139159
The assumptions problem was issue 1717.
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