#15878: is_subring is returning false negatives for number fields
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Reporter: stankewicz | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: commutative algebra | Resolution:
Keywords: rings, number fields, homset, | Merged in:
coercion | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by nbruin):
I propose this to close as "won't fix/not valid" for the reason that if R
is *isomorphic* to a subring of S, we don't have that R is canonically
identified with a subring of S. There can be a choice of isomorphism.
It may be OK to consider R a subring of S if sage has an injective
coercion from R to S registered, but I'm not even sure this should always
be the case even then.
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Ticket URL: <http://trac.sagemath.org/ticket/15878#comment:4>
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