#16662: OA for n=1046,1059,2164,3992,3994
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Reporter: ncohen | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.4
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: u/ncohen/16662 | 355ac2a741154e5fca99ec1d5137c5be0b9d4377
Dependencies: #16604 | Stopgaps:
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Comment (by ncohen):
Hello !
> 1) I corrected typos in the doc, added a check, added a test, modify few
sentences at u/vdelecroix/16662
Is it me or is the git server slow ? It takes MINUTES to download a branch
`O_o`
> 2) I do not understand why he following is not valid
How, not "valid" ? The input is valid but in order to build the new
designs you need some sub-designs, and among the subdesigns there is a
`OA(10,69)` that Sage does not know how to build. Soo well, the
construction can't be applied because you need one of the required
designs... What's wrong with that ? This is what the `find_` functions
usually checks !
> Are a,b,c allowed to be 1? In the examples of the article a,b,c are
never 1 (but d might be).
I don't think that there is anything wrong with =1 values.
> 3) I found two examples which yield to error I do not understand from
the specifications. The first one is related to the point 2) I guess
No, it is just that there exists no `OA(13,2)`. The code has to build an
`OA(k+3,n)` (or `OA(k+4,n)` when `d` is defined) and it does not exist if
k is too large. I missed that one, probably because that's the kind of
thing that I filter in the `find_` function usually.
> For the other one, the existence of an OA(9,21) should not be necessary
for the construction
The exception I added for the previous one is also triggered here.
> 4) I found several new values for which the thwart construction works.
But I first would like to understand first why 3) fail.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16662#comment:6>
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