Ok, thank you! On Friday, June 14, 2019 at 2:17:23 PM UTC-4, Henry Talbott wrote: > > The following code produces the weird result: > > sage: R.<c>=QQ[] > sage: S.<x,y>=R[] > sage: u=FractionField(S)(x^2+y^2) > sage: v = u.numerator()/u.denominator() > sage: print u.numerator().parent() > sage: print v.numerator().parent() > > Output: > > Multivariate Polynomial Ring in x, y over Univariate Polynomial Ring in c > over Rational Field > Multivariate Polynomial Ring in x, y over Fraction Field of Univariate > Polynomial Ring in c over Rational Field > > Since u.denominator()=1, I expected v to be equal to u, and certainly for > their numerators to be over the same base field. I think the base field > change may be an issue with the method inverse_of_unit in > rings/polynomial/multi_polynomial_element.py. > > Any advice would be greatly appreciated! This base field change was > causing an error with the dynatomic_polynomial method. > > >
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