#16388: Specify the values of k,n in the exceptions
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Reporter: ncohen | Owner:
Type: enhancement | Status: positive_review
Priority: major | Milestone: sage-6.3
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers: Vincent Delecroix
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: u/ncohen/16388 | 79178b62b55c9d38b4ee015118e1cbc6acefb8f8
Dependencies: | Stopgaps:
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Comment (by ncohen):
Yo !
> The terminology is not understandable:
I just sent you "Combinatorial Designs: Construction and Analysis" from
Douglas Stinson which uses `(v,k,lambda)-BIBD`, `TD(k,n)` and `OA(k,n)`. I
believed that the Handbook of Combinatorial Designs did the same but they
actually write `BIBD(v,k,lambda)`. Their purpose was probably to unify
notations, given that `(v,k,lambda)-BIBD` is a pretty common :
http://www.maths.qmul.ac.uk/~leonard/repeated11.pdf
http://www.argilo.net/files/bibd.pdf
You will also find other occurrences of this naming in the references of
the Handbook.
Othey guys say 2-(v,k,lambda) design.
> - MOLS(n,k) but TD(k,n)
> - (v,k,lambda)-BIBD but TD(v,k,lambda)
Two remarks :
- `MOLS(n,k)` does not appear in Sage's code
- It is true that the constructor of MOLS takes first a k then an n as
input. It is true that it can lead to mistakes, and perhaps we should
change it.
- If you insist on using BIBD(v,k,lambda) it can be done but it has to be
a global change as some pages, eg
http://sagemath.org/doc/reference/combinat/sage/combinat/designs/bibd.html
already use this terminology. Same for PBD.
> good luck for your future merges... (now you are used to it ;-P)
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16388#comment:15>
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