Comment #6 on issue 2607 by asmeurer: as_numer_denom() is too slow http://code.google.com/p/sympy/issues/detail?id=2607
Actually, I don't think as_numer_denom can make sense in the non-commutative case (we should check that it doesn't try to make sense of it). Because if you have a1*d1**-1 + a2*d2**-1 (all non-commutative), there's no way to factor out d1**-1*d2**-1.
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