Constructions of External Difference Families and Disjoint Difference Families
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External difference families (EDFs) are a type of new combinatorial designs originated from cryptography. In this paper, some earlier ideas of recursive and cyclotomic constructions of combinatorial designs are extended, and a number of classes of EDFs and disjoint difference families are presented. A link between a subclass of EDFs and a special type of (almost) difference sets is set up.
KeywordsDifference sets Difference systems of sets Disjoint difference families External difference families
AMS Classification05B05 94A66
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