#17585: Implement coordinate_ring() for free module elements
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Reporter: jdemeyer | Owner:
Type: defect | Status: needs_info
Priority: major | Milestone: sage-6.5
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/ticket/17585 | dbca6bb7915f3084b04af6943689ab0d244d7032
Dependencies: #17584, #17694, | Stopgaps:
#13081, #12600 |
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Changes (by vdelecroix):
* status: needs_review => needs_info
Comment:
1. Do we really want to allow `non exact` coordinate rings with `exact`
base ring? You replaced a test about exactness of the base ring with
exactness of the coordinate ring.
2. What is the point of the `ring` argument of `basis_matrix`? Moreover
the implementation looks wrong since it returns the matrix `A` (defined
over the `coordinate_ring`) as soon as `ring` is the `base_ring`.
3. Do we really need the method `coordinate_ring`/`base_ring` defined on
vectors? These are methods of the parent (and are implemented as such). I
do not see the point of that much duplication.
--
Ticket URL: <http://trac.sagemath.org/ticket/17585#comment:22>
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