Abstract
A set of permutations of length v is t-suitable if every element precedes every subset of t − 1 others in at least one permutation. The maximum length of a t-suitable set of N permutations depends heavily on the relation between t and N. Two classical results, due to Dushnik and Spencer, are revisited. Dushnik’s result determines the maximum length when \(t > \sqrt{2N}\). On the other hand, when t is fixed Spencer’s uses a strong connection with binary covering arrays of strength t − 1 to obtain a lower bound on the length that is doubly exponential in t. We explore intermediate values for t, by first considering directed packings and related Golomb rulers, and then by examining binary covering arrays whose number of rows is approximately equal to their number of columns. These in turn are constructed from Hadamard and Paley matrices, for which we present some computational data and questions.
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Dedicated to Hadi Kharaghani on the occasion on his 70th birthday
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Colbourn, C.J. (2015). Suitable Permutations, Binary Covering Arrays, and Paley Matrices. In: Colbourn, C. (eds) Algebraic Design Theory and Hadamard Matrices. Springer Proceedings in Mathematics & Statistics, vol 133. Springer, Cham. https://doi.org/10.1007/978-3-319-17729-8_3
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DOI: https://doi.org/10.1007/978-3-319-17729-8_3
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