#10667: Morphisms and Objects of Categories
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Reporter: SimonKing | Owner: nthiery
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.0
Component: categories | Keywords: objects
morphisms containment
Work_issues: Cope with non-unique number fields | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #9138,
#11115, #11780
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Comment(by nthiery):
Replying to [comment:59 SimonKing]:
> And `_reduce_from_homset_cache` is only for those parents that
> happen to belong to the category of rings. That's why I write "try
> ... (which would ... only be available for rings)". It would not be
> available for non-rings, and in particular not for non-parents. So,
> no problem, the attribute error would be caught anyway.
Yes, it would work. Yet, in a perfect world, UniqueRepresentation
ought to be generalized outside of Sage, as a general purpose Python
tool (even though I am not sure anyone will take the time for
that). So having some logic in there specifically targetted toward
homsets smells. But maybe it's just a question of finding a more
general name for this hook.
> No, it could not, because most parents are no `UniqueRepresentation`s.
Good point :-)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10667#comment:64>
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