#12748: An inconsistent term order must not be accepted as input of a polynomial
ring construction
---------------------------------------------+------------------------------
Reporter: SimonKing | Owner: malb
Type: defect | Status: needs_info
Priority: major | Milestone: sage-5.0
Component: commutative algebra | Resolution:
Keywords: polynomial ring termorder | Work issues:
Report Upstream: N/A | Reviewers: Simon King
Authors: Martin Albrecht | Merged in:
Dependencies: | Stopgaps:
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Changes (by SimonKing):
* status: needs_review => needs_info
Comment:
I experimented with moving the error to the `__copy` method. However, it
turns out that
{{{
sage -t devel/sage-
main/sage/rings/polynomial/multi_polynomial_ideal.py # 23 doctests failed
sage -t devel/sage-main/sage/rings/polynomial/plural.pyx # 9
doctests failed
sage -t devel/sage-
main/sage/rings/polynomial/multi_polynomial_libsingular.pyx # 2 doctests
failed
sage -t devel/sage-
main/sage/rings/polynomial/multi_polynomial_element.py # 2 doctests failed
sage -t devel/sage-
main/sage/rings/polynomial/multi_polynomial.pyx # 5 doctests failed
}}}
because the copy method is called with (say) 6 variables on an input of
(say) 5 variables.
Question: If T is a term order with a known number of variables, do we
really want that `T.__copy(t)` works, where t is a term order with a
different number of variables?
If the answer is "yes", then I give your patch a positive review and
provide a small reviewer patch using the :trac: directive.
If the answer is "no", then what shall we do? Apparently the `__copy`
method ''is'' called with different numbers of variables. Shall we deal
with that on a different ticket or here?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12748#comment:4>
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