#20963: __invert__ for Laurent polynomial is wrong
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Reporter: vdelecroix | Type: defect
Status: new | Priority: major
Milestone: sage-7.3 | Component: algebra
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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The parent of the inverse of a Laurent polynomial can be three different
things
{{{
sage: R.<x> = LaurentPolynomialRing(ZZ)
sage: parent(~x)
Univariate Laurent Polynomial Ring in x over Integer Ring
sage: parent(~(2*x))
Univariate Laurent Polynomial Ring in x over Rational Field
sage: parent(~(x+1))
Fraction Field of Univariate Polynomial Ring in x over Integer Ring
}}}
This is against the principle: "the result of an arithmetic operation
should only depend on the parent".
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Ticket URL: <https://trac.sagemath.org/ticket/20963>
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