#16598: Useless new classes and a replacement for _check_pbd
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Reporter: ncohen | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: u/ncohen/16598 | fa3c715732a965786f86a2a0ce7087c63294519a
Dependencies: #16553 | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:14 ncohen]:
> > So, it makes sense to have `.is_gdd()` at the level of
`IncidenceStructure` and make it returns the groups if needed. We can also
have a method `.groups()` on `IncidenceStructure` without any attribute
`._groups` defined.
> >
> > What do you think?
>
> I don't like it, you cannot define "groups" properly at this level. What
do you think the "groups" of `IncidenceStructure(3,[[1,2]])` should be ?
All right, add the extra assumption that each point is covered by at least
one block! If not `.groups()` through an exception.
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Ticket URL: <http://trac.sagemath.org/ticket/16598#comment:15>
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