#8745 closed enhancement (fixed)
Steiner Triple Systems
Reported by: | ncohen | Owned by: | sage-combinat |
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Priority: | major | Milestone: | sage-4.4.1 |
Component: | combinatorics | Keywords: | |
Cc: | wdj | Merged in: | sage-4.4.1.alpha2 |
Authors: | Nathann Cohen | Reviewers: | David Joyner |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
This patch adds a function to block_design returning a Steiner Triple System on any number of vertices n congruent to 1 or 3 modulo 6. There is none otherwise :-)
The function is pretty short, a satisfiable decomposition being explicitely given in the reference : http://www.utu.fi/~honkala/designs.ps
Nathann
Attachments (1)
Change History (7)
Changed 9 years ago by
comment:1 Changed 9 years ago by
- Status changed from new to needs_review
comment:2 Changed 9 years ago by
- Status changed from needs_review to positive_review
comment:3 Changed 9 years ago by
Whaouuuuuuu !!! Such a quick review :-)
Thank you very much too !! :-)
Nathann
comment:4 Changed 9 years ago by
- Merged in set to 4.4.1.alpha2
- Resolution set to fixed
- Status changed from positive_review to closed
comment:5 Changed 9 years ago by
- Reviewers set to David Joyner
comment:6 Changed 9 years ago by
- Merged in changed from 4.4.1.alpha2 to sage-4.4.1.alpha2
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Applies fine to 4.4.a1, passes sage -testall on a 10.6.2 mac (except for the r.py failure, which is unrelated), and looks good to me in terms of examples and references.
Thanks Nathann!