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Maximal Residue Difference Sets Modulo P, Duncan A. Buell, Kenneth S. Williams
Maximal Residue Difference Sets Modulo P, Duncan A. Buell, Kenneth S. Williams
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Let p ≡ 1 (mod 4) be a prime. A residue difference set modulo p is a set S = {ai} of integers ai such that (ai/p) = +1 and ((ai - aj)/p) = +1 for all i and j with i ≠ j, where (n/p) is the Legendre symbol modulo p. Let mp be the cardinality of a maximal such set S. The authors estimate the size of mp.