On orthogonal arrays of strength 3 and 5 achieving Rao's bound |
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Authors: | Ryuzaburo Noda |
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Affiliation: | 1. Department of Mathematics, College of Liberal Arts and Sciences, Okayama University, 700, Tsushima, Okayama, Japan
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Abstract: | It is shown that ifA is an orthogonal array (N, n, q, 3) achieving Rao's bound, thenA is either - an orthogonal array (2n, n, 2, 3) withn ≡ 0 (mod 4), or
- an orthogonal array (q 3,q + 2,q, 3) withq even.
This result should be compared with a theorem of P.J. Cameron on extendable symmetric designs. It is also shown that ifA is an orthogonal array (N, n, q, 5) achieving Rao's bound, thenA is either the orthogonal array (32, 6, 2, 5) or the orthogonal array (36, 12, 3, 5). |
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