#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 saraedum):
Replying to [comment:25 pbruin]:
> Now it is already the case that one can specify an `embedding` parameter
when creating a number field. Hence (finally) the following question:
does the concept of a `structure` in the sense of this ticket allow the
existing `embedding` parameter to be implemented as a special case of a
`structure`?
Not really. One difference is that two fields with different `embedding`
are not considered equal, but two fields with different `structure` are. I
think this makes sense since `structure` currently tells you how a field
has been created (e.g. as the absolute field of a relative field.)
However, treating two number fields with different complex embedding as
being the same would most probably lead to nasty bugs.
There might be a more general concept that `structure` and `embedding` are
special cases of but I would not try to abuse one of them for this (right
now). There is probably too much code that expects these two attributes to
have a specific format to make such a change. It could be the content of a
followup ticket.
--
Ticket URL: <http://trac.sagemath.org/ticket/11670#comment:26>
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