#16524: OA(9,135)
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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/16524 | c6e78c8f358758c88fd5fe7d806c9ead5e503a33
Dependencies: #16503 | Stopgaps:
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Comment (by ncohen):
Yo !
> This is not clear (at least to me)
> {{{
> This is possible, because `PG(2,2)` is a subdesign in `PG(2,16)`; in a
> cyclic `PG(2,16)` or `BIBD(273,17,1)` the points `\equiv 0 \pmod{39}`
> form such a subdesign.
> }}}
Ahahahah. It is "Julian Abel's truth". And as the constructions works...
`:-)`
> It would be better to have the (273,17,1) from the difference family
constructor... I just did it and there is an extra check in the doc that
it is actually a cyclic one: `u/vdelecroix/16524`.
I just pushed it to the branch, but in the future I guess that we will
remove this function as we add the patch of all DF found in the handbook.
We will not create a function for each of them, and it will be a
dictionary ... Anyway !
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16524#comment:9>
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