#13670: Inversion in polynomial quotient rings should not say NotImplemented
when
element is non-invertible
-----------------------------------+----------------------------------------
Reporter: Bouillaguet | Owner: malb
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.5
Component: commutative algebra | Keywords: polynomial rings
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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{{{
sage: R.<x1,x2> = QQ[]
sage: S = R.quotient_ring( R.ideal(x2**2 + x1 - 2, x1**2 - 1) )
sage:
sage: 1 / S(x1 + x2)
...
NotImplementedError:
}}}
In fact, the element is non-invertible. The test used to check for
invertibility is correct and complete, so we should return a "!ValueError:
Non-invertible exception" instead.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13670>
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