#16323: Construction of BIBD with k=5
-------------------------------------+-------------------------------------
Reporter: ncohen | Owner:
Type: enhancement | Status: needs_info
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/16323 | 07a31304b9d48ef6e07f1dd96c1d3185b8fafc95
Dependencies: #16279 | Stopgaps:
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Comment (by vdelecroix):
Hi Nathann,
I did the modif in my branch. I also put the case `v == k` before since
`[[1]]` is a valid BIBD(1,1), isn't it? I also changed some of the
`ValueError` to `EmptySetError` or `NotImplementedError`. Now we have
{{{
sage: designs.BalancedIncompleteBlockDesign(5,6)
...
EmptySetError: No such design exists !
sage: designs.BalancedIncompleteBlockDesign(1,6)
...
EmptySetError: No such design exists !
sage: designs.BalancedIncompleteBlockDesign(1,5)
...
EmptySetError: No such design exists !
}}}
For the `BIBD_from_difference_family` there is now a proper documentation.
I also learn that there are some constructions of Wilson, Baratti and
Abel-Baratti to build difference families.
I still have the Zmod in my branch and I do not know if you want to get
rid of them.
Vincent
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Ticket URL: <http://trac.sagemath.org/ticket/16323#comment:12>
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