Updates:
Status: New
Labels: -Milestone-Release0.6.5 Milestone-Release0.7.0
Comment #14 on issue 1263 by robert.kern: Invalid movement of roots across
fractions
http://code.google.com/p/sympy/issues/detail?id=1263
The bug seems to be back:
In [2]: z = Symbol('z', real=True, negative=True)
In [3]: sqrt(1/z)
Out[3]: (1/z)**(1/2)
In [4]: simplify(sqrt(1/z))
Out[4]: z**(-1/2)
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