#17740: Division of modules by basering elements should not pass to the fraction
field.
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Reporter: robertwb | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.5
Component: coercion | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: u/robertwb | Commit:
/coerce-div | 6a507b79f14c7db4f28ac841996cc2ef3d1ba71d
Dependencies: | Stopgaps:
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Comment (by robertwb):
Yes, I've actually been thinking about that as well, and I'm not sure
exactly how best to handle this. GF(5)['x']['y'] is a GF(5)-module but
represented as a GF(5)['x']-module. Or, put otherwise, (most) elements of
ZZ have an inverse in GF(5); we want to take the most conservative inverse
possible.
I used to be very against partial coercions like QQ -> GF(p), but I'm not
as sure anymore.
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Ticket URL: <http://trac.sagemath.org/ticket/17740#comment:6>
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