#17364: Homset categories should be subcategories of the category of all homsets
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Reporter: nthiery | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.5
Component: categories | Resolution:
Keywords: | Merged in:
Authors: Nicolas M. Thiéry | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/nthiery/all_homsets_category_should_be_subcategories_of_the_category_of_all_homsets|
0925390c0d1eacabd75bb24c815d30124c8e8a2b
Dependencies: | Stopgaps:
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Comment (by pbruin):
Replying to [comment:9 nthiery]:
> > Note that the fact that Hom sets of modules are Abelian groups is not
reflected in the output of the last command.
>
> This is not about the infrastructure (which is the theme of this
> ticket), but about what Sage knows about Hecke modules (which is what
> the TODO I left is about):
>
> - If the category Hecke modules is a full subcategory of the category
> of modules, Sage should be told about this by implementing
> `HeckeModules.additional_structure` to return `None`.
>
> - Otherwise, one needs to state explicitly that
> `HeckeModules(ZZ).Homsets()` is a subcategory of `AbelianGroups()`
> (or whatever appropriate) in
> `HeckeModules.Homsets.extra_super_categories`.
OK, I see. Thanks for the clarification!
--
Ticket URL: <http://trac.sagemath.org/ticket/17364#comment:10>
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