#11670: fix number fields being unique parents -- this got broken over the years
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Reporter: was | Owner: davidloeffler
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.2
Component: number fields | Resolution:
Keywords: | Merged in:
Authors: Julian Rueth | Reviewers: Simon King
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/saraedum/ticket/11670 | 70702aa690a31cc36b9febe36462c67ebd57dcee
Dependencies: | Stopgaps:
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Comment (by pbruin):
Replying to [comment:26 saraedum]:
> Not really. One difference is that two fields with different `embedding`
are not considered equal, but two fields with different `structure` are.
OK, I misunderstood the discussion on this ticket so far (I did not yet
look at the code carefully); I somehow concluded that your implementation
answered Simon's question from comment:13 with "yes". So do I understand
correctly that two number fields are explicitly allowed to be equal but
not identical? Is this really desirable? From the
[http://sagemath.org/doc/reference/structure/sage/structure/unique_representation.html
manual page] on unique representation:
"Instances of a class have a unique representation behavior when instances
evaluate equal if and only if they are identical (i.e., share the same
memory representation), if and only if they were created using equal
arguments. [...] This behaviour is typically desirable for parents and
categories."
--
Ticket URL: <http://trac.sagemath.org/ticket/11670#comment:27>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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