Am 2014-09-18 um 18:12 schrieb Travis Scrimshaw:
> Hey,
>    Things like this have popped up in a few places, where doing things in a
> fraction field over ZZ behaves much better than over QQ. I feel that anytime

The same problem is in the Fraction Field of Univariate Polynomial Ring in u
over Integer Ring:

   sage: R1 = PolynomialRing(ZZ, names=['u']).fraction_field()
   sage: (u,) = R1.gens()
   sage: a = 1/(1 - u)
   sage: b = -1/(u - 1)
   sage: a == b
   True
   sage: hash(a) == hash(b)
   False


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