#11474: Elliptic curves should be unique parent structures
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Reporter: SimonKing | Owner: cremona
Type: defect | Status: needs_info
Priority: major | Milestone: sage-6.2
Component: elliptic curves | Resolution:
Keywords: unique parent | Merged in:
Authors: Simon King | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by pbruin):
One remark about the approach to follow to make elliptic curves satisfy
unique representation: it turns out that there is an important problem
with using `UniqueRepresentation` (which Simon's patch introduces)
together with caching (which is certainly used by `EllipticCurve`), see
https://groups.google.com/forum/#!topic/sage-devel/q5uy_lI11jg. If I
remember correctly, for non-trivial parents it is recommended to use a
`UniqueFactory`, which gives more flexibility than `UniqueRepresentation`.
(I personally also understand `UniqueFactory` better than the
`__classcall__()` magic of Simon's patch, but that may be simply because I
am too familiar with this part of the internals of Sage.) Maybe Simon or
someone else can elaborate on this point?
--
Ticket URL: <http://trac.sagemath.org/ticket/11474#comment:20>
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