#18439: is_projective_plane for incidence structure
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Reporter: q.honore | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.7
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers: Vincent Delecroix
Authors: Quentin Honoré | Work issues:
Report Upstream: N/A | Commit:
Branch: | 980680371fce74966baa1982a0d0ed24c6cd7a03
u/q.honore/is_projective_plane | Stopgaps:
Dependencies: |
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Comment (by vdelecroix):
Replying to [comment:4 ncohen]:
> I am not sure if such a function is actually needed, but you will find
that most of the job has already been done in two functions:
Might be useful to have an alias directly on incidence structures. Though,
not essential.
> -
sage.combinat.designs.block_designs.are_hyperplanes_in_projective_geometry_parameters
This is one is pretty unrelated
> - sage.combinat.designs.designs_pyx.is_pairwise_balanced_design
This one is useful but not complete (since it does not check for the
existence of quadrilateral). Moreover, I found out that there is a wrong
reference `sage.combinat.designs.designs_pyx.is_group_divisible_design`
mentions `sage.combinat.designs.incidence_structures.GroupDivisibleDesign`
which does not exists (it is
`sage.combinat.designs.group_divisible_designs.GroupDivisibleDesign`).
Would be cool to make the correction in this ticket.
Vincent
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Ticket URL: <http://trac.sagemath.org/ticket/18439#comment:5>
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