A Howell design admitting A51
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R.A. Bailey
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Article
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1997
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Elsevier Science
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English
โ 380 KB
There is a regular graph with 12 vertices and valency 6 which has three mutually orthogonal 1-factorizations. Any pair of these can be interpreted as a Howell design or semi-Latin square. The automorphism group of the graph is A5 x Z2; it preserves the above three 1-factorizations as a set, interch