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| table_seating [2024-04-11 10:19] – [Strict] nik | table_seating [2024-04-11 10:20] – [Strict] nik |
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| Versions include [[https://en.wikipedia.org/wiki/Kirkman%27s_schoolgirl_problem|Kirkman's Schoolgirl Problem]] (15 children walk in groups of 3, can they do this so that all pairs of girls walk together exactly once over a whole week) {[[https://oeis.org/search?q=schoolgirl&sort=&language=german&go=Suche|oeis]]}. This is the question as to resolvable $(v,3,1) $2$-designs, which if I understand it, exist $\iff v = 3 mod 6$. | Versions include [[https://en.wikipedia.org/wiki/Kirkman%27s_schoolgirl_problem|Kirkman's Schoolgirl Problem]] (15 children walk in groups of 3, can they do this so that all pairs of girls walk together exactly once over a whole week) {[[https://oeis.org/search?q=schoolgirl&sort=&language=german&go=Suche|oeis]]}. This is the question as to resolvable $(v,3,1)$ 2-designs, which if I understand it, exist $\iff v = 3 mod 6$. |
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| For pairs, resolvable $(v,2,1) 2$-designs exist only for $even v, v >= 4$. | For pairs, resolvable $(v,2,1) 2$-designs exist only for $even v, v >= 4$. |
nik