Packing of permutations into Latin squares
For every positive integer \(n\) greater than \(4\) there is a set of Latin squares of order \(n\) such that every permutation of the numbers \(1,\ldots,n\) appears exactly once as a row, a column, a reverse row or a reverse column of one of the given Latin squares. If \(n\) is greater than \(4\) an...
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Veröffentlicht in: | arXiv.org 2020-06 |
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Sprache: | eng |
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Zusammenfassung: | For every positive integer \(n\) greater than \(4\) there is a set of Latin squares of order \(n\) such that every permutation of the numbers \(1,\ldots,n\) appears exactly once as a row, a column, a reverse row or a reverse column of one of the given Latin squares. If \(n\) is greater than \(4\) and not of the form \(p\) or \(2p\) for some prime number \(p\) congruent to \(3\) modulo \(4\), then there always exists a Latin square of order \(n\) in which the rows, columns, reverse rows and reverse columns are all distinct permutations of \(1,\ldots,n\), and which constitute a permutation group of order \(4n\). If \(n\) is prime congruent to \(1\) modulo \(4\), then a set of \((n-1)/4\) mutually orthogonal Latin squares of order \(n\) can also be constructed by a classical method of linear algebra in such a way, that the rows, columns, reverse rows and reverse columns are all distinct and constitute a permutation group of order \(n(n-1)\). |
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ISSN: | 2331-8422 |