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• Distances sets that are a shift of the integers and Fourier basis for planar convex sets ﻿

(2007-09)
The aim of this paper is to prove that if a planar set $A$ has a difference set $\Delta(A)$ satisfying $\Delta(A)\subset \Z^++s$ for suitable $s$ than $A$ has at most 3 elements. This result is motivated by the conjecture ...