Updates:
Labels: Assumptions
Comment #1 on issue 2696 by asmeurer: Assumptions fail for non-commutative
symbols
http://code.google.com/p/sympy/issues/detail?id=2696
The new assumptions seem to handle it correctly:
In [1]: x = Symbol('x', commutative=False)
In [2]: print ask(Q.irrational(-x))
None
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