#19269: add category Posets to ZZ and QQ
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Reporter: dkrenn | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.9
Component: categories | Resolution:
Keywords: | Merged in:
Authors: Daniel Krenn | Reviewers:
Report Upstream: N/A | Work issues:
Branch: u/dkrenn/cat/ZZ- | Commit:
poset | c1d0720cc0b80041c8fdda8c85ec89bc031749ae
Dependencies: | Stopgaps:
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Comment (by dkrenn):
Replying to [comment:13 vdelecroix]:
> Indeed, it was a question... One possibility: make some priorities for
the `Hom` functor in `sage.categories.homset`.
>
> Currently, to deduce the category of `Hom(X,Y)` the functor does
`X.category()._meet_(Y.category())` which is documented as being "the
largest common subcategory of self and other". Instead of `_meet_` one
could try to implement a more dedicated method that forget some of the
categories (such as the Poset one if there is some algebraic structure).
This could be something like an negated version of
`extra_super_categories`, which kicks the specified (forbidden) categories
out...
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Ticket URL: <http://trac.sagemath.org/ticket/19269#comment:14>
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