#15431: Transversal Design TD(6,12)
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Reporter: | Owner:
ncohen | Status: needs_review
Type: | Milestone: sage-6.2
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
combinatorics | Work issues:
Keywords: | Commit:
Authors: | 8273741e4f9cd86c788e2769084c954c24b1c8cf
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
u/ncohen/15431 |
Dependencies: |
#15287 #15368 |
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Comment (by ncohen):
Yo !
> Let me mention that `\sqcup` does not mean that they are disjoint but
that you take the [[http://en.wikipedia.org/wiki/Disjoint_union|disjoint
union]]. The set `A \sqcup A` is perfectly valid and will have cardinality
twice the one of `A`. So I would actually prefer a `\cup` if it is what
you intended to do.
Okayyy, I updated the commit again to remove those `sq`.
Sage is such a wonderfully perfect software that all we have to do now is
discuss the use of `sqcup` and `cup`. Everything else has been solved.
> The documentation is much better in `is_transversal_design` because of
the NOTE block. But there is nothing in `transversal_design`. Could you do
a copy/paste or something.
>
> (For me, it would be clearer for a TD to be a subset of `V1 x V2 x ... x
Vk` but let us stick to conventions).
That's precisely why we have both TD and OA. Because you can easily
intersect the sets of a TD, but you cannot intersect elements of `V1 x V2
x ... x Vk`.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/15431#comment:35>
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