Re: [R] Permutations

From: Christian T. Steigies <cts_at_debian.org>
Date: Thu 15 Jul 2004 - 17:31:21 EST

On Wed, Jul 14, 2004 at 07:42:49PM +0200, Jordi Altirriba Gutiérrez wrote:
>
> I’ve 12 elements in blocks of 3 elements and I want only to make
> permutations inter-blocks (no intra-blocks) (sorry if the terminology is
> not accurate)

I am not a mathematician, but this sounds to me a little bit like Kirkman's Schoolgirl Problem:

In a boarding school there are fifteen schoolgirls who always take their daily walks in rows of threes. How can it be arranged so that each schoolgirl walks in the same row with every other schoolgirl exactly once a week?

http://mathworld.wolfram.com/KirkmansSchoolgirlProblem.html

Christian



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