#16281: redesign projective plane
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.2
Component: combinatorics | Resolution:
Keywords: design, | Merged in:
projective plane | Reviewers:
Authors: Vincent Delecroix | Work issues:
Report Upstream: N/A | Commit:
Branch: | 429d815568a0e4a90e4968e55d45548f2e0c7262
u/vdelecroix/16281 | Stopgaps:
Dependencies: |
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Comment (by ncohen):
Yo !
> Because of the argument "type"... funny isn't it?
Come on.... I am not even sure this thing ever appeared in a public
release, and it does nothing.... I think it is safe to use a
`deprecated_function_alias`. Actually it is even safe to remove it without
warning...
> I do not know what is a bibd and I did not have a look at it (except
changing the call to !ProjectivePlaneDesign). If you feel like removing
more code I am happy with that but I will not do it (if you do, wait until
the other remarks are implemented).
Well. If you have a ProjectivePlane (a Projective Plane is a BIBD) named
`PP` and do `PP = _relabel_BIBD(PP)` then if you remove from the new `PP`
all blocks that contain the "maximum point" (i.e. n-1) then you have a
properly labeled TD.
> Nope: in a projective plane there should be a quadrilateral.
Right. I had some (theoretical) problems with degenerate projective planes
recently `:-P`
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16281#comment:5>
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