#9429: Undesirable behaviour when deriving from QuotientRingElement
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Reporter: vbraun | Owner: AlexGhitza
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.5
Component: algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by novoselt):
* status: needs_review => needs_work
Comment:
I have added a couple of printing lines into the quotient ring and got the
following:
{{{
sage: FF = FiniteField(7)
sage: P.<x> = PolynomialRing(FF)
_coerce_map_from_(Finite Field of size 7, <type 'int'>)
_coerce_map_from_(Finite Field of size 7, Integer Ring)
_element_constructor_(Finite Field of size 7, 0)
sage: x + 1
_element_constructor_(Finite Field of size 7, 1)
...
TypeError: unsupported operand parent(s) for '+':
'Univariate Polynomial Ring in x over Finite Field of size 7'
and 'Integer Ring'
sage: isinstance(FF, sage.rings.quotient_ring.QuotientRing_generic)
True
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9429#comment:4>
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