#19741: Fix coercions involving PolynomialQuotientRings
-------------------------------------+-------------------------------------
Reporter: mmezzarobba | Owner:
Type: defect | Status: new
Priority: minor | Milestone:
Component: algebra | Keywords:
Merged in: | Authors: Marc Mezzarobba
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | u/mmezzarobba/polyquo
b13d4df233c7e01e419c4c19c4fd4d63dc97c380| Dependencies:
Stopgaps: |
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`PolynomialQuotientRing_generic.construction()` calls `is_field()` in
attempt to pass `as_field=True` to `QuotientFunctor` in some cases. As far
as I understand, this is not necessary, and probably even incorrect
(`PolynomialQuotientRing_generic` has no `field()` method, only
`number_field()`, and `NumberField`s are constructed using
`AlgebraicExtensionFunctor`, not `QuotientFunctor`), but this breaks basic
arithmetic when polynomial factorization over the cover ring is not
implemented.
{{{
sage: Pol.<y> = CBF[]
sage: Quo.<y> = Pol.quotient(y^3)
sage: CBF.zero()*y
...
NotImplementedError:
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/19741>
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