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On generalized perfect difference sets constructed from Sidon sets
Institution:Department of Mathematics, Nanjing University of Information Science & Technology, Nanjing 210044, PR China
Abstract:Let N be the set of positive integers. For a nonempty set A of integers and every integer u, denote by dA(u) the number of (a,a) with a,aA such that u=a?a. For a sequence S of positive integers, let S(x) be the counting function of S. The set A?N is called a perfect difference set if dA(u)=1 for every positive integer u. In 2008, Cilleruelo and Nathanson (2008) 4] constructed dense perfect difference sets from dense Sidon sets. In this paper, as a main result, we prove that: let f:NN be an increasing function satisfying f(n)2 for any positive integer n, then for every Sidon set B and every function ω(x), there exists a set A?N such that dA(u)=f(u) for every positive integer u and B(x/3)?ω(x)A(x)B(x/3)+ω(x) for all xCf,B,ω.
Keywords:Perfect difference set  Sidon set  Representation
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