#16476: New difference family (25,4,1) and cleanup in bibd.py
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: combinatorial designs | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #16461 | Stopgaps:
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Changes (by vdelecroix):
* status: new => needs_review
Old description:
> In the construction of Stinson book the `BIBD(25,4,1)` comes from a
> difference family so we can just add it to the database. Moreover the
> function `PBD_4_5_8_9_12` previously failed for `v=4,5,7,8,9,12` where
> the trivial answer `[range(v)]` just fits.
New description:
In the construction of Stinson book the `BIBD(25,4,1)` comes from a
difference family so we can just add it to the database. Moreover the
function `PBD_4_5_8_9_12` previously failed for `v=4,5,8,9,12` where the
trivial answer `[range(v)]` just fits.
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Comment:
All right, this is rather trivial, but it cleans a bit the bibd stuff.
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Ticket URL: <http://trac.sagemath.org/ticket/16476#comment:1>
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