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Perfect binary arrays and difference sets

✍ Scribed by Jonathan Jedwab; Chris Mitchell; Fred Piper; Peter Wild


Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
702 KB
Volume
125
Category
Article
ISSN
0012-365X

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✦ Synopsis


A perfect binary array is an r-dimensional array with elements k 1 such that all out-of-phase periodic autocorrelation coefficients are zero. Such an array is equivalent to a Menon difference set in an abelian group. We give recursive constructions for four infinite families of two-dimensional perfect binary arrays, using only elementary methods. Brief outlines of the proofs were previously given by three of the authors. Although perfect binary arrays of the same sizes as two of the families were constructed earlier by Davis, the sizes of the other two families are new.


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A perfect system of difference sets with threshold c is a partition of a consecutive run of integers beginning with c into full difference sets of valency at least 2. The BKT inequality, due to Bermond, Kotzig and Turgeon gives a necessary condition for the existence of such systems; systems for whi