#11368: can't coerce pari to rational function field
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Reporter: katestange | Owner: robertwb
Type: defect | Status:
Priority: minor | needs_review
Component: coercion | Milestone: sage-6.1
Keywords: coercion pari rational | Resolution:
fraction_field string | Merged in:
Authors: Peter Bruin | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/pbruin/11368-coerce_rational_function_field | Stopgaps:
Dependencies: |
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Changes (by {'newvalue': u'Peter Bruin', 'oldvalue': ''}):
* status: new => needs_review
* changetime: 12/20/13 06:19:13 => 12/20/13 06:19:13
* branch: => u/pbruin/11368-coerce_rational_function_field
* author: => Peter Bruin
Old description:
> The following fails
> {{{
> sage: R.<x,y> = PolynomialRing(QQ)
> sage: S = R.fraction_field()
> sage: S(pari((x+y)/y))
> TypeError: no canonical coercion from Fraction Field of Multivariate
> Polynomial Ring in x, y over Rational Field to Rational Field
> }}}
> However, if you replace (x+y)/y with x+y, it works (in other words,
> polynomials work but rational functions don't).
New description:
The following fails
{{{
sage: R.<x,y> = PolynomialRing(QQ)
sage: S = R.fraction_field()
sage: S(pari((x+y)/y))
TypeError: no canonical coercion from Fraction Field of Multivariate
Polynomial Ring in x, y over Rational Field to Rational Field
}}}
However, if you replace (x+y)/y with x+y, it works (in other words,
polynomials work but rational functions don't).
--
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Ticket URL: <http://trac.sagemath.org/ticket/11368#comment:5>
Sage <http://www.sagemath.org>
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