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Search: MSC category 42A55 ( Lacunary series of trigonometric and other functions; Riesz products )

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1. CMB 2016 (vol 59 pp. 521)

Hare, Kathryn; Ramsey, L. Thomas
The Relationship Between $\epsilon$-Kronecker Sets and Sidon Sets
A subset $E$ of a discrete abelian group is called $\epsilon $-Kronecker if all $E$-functions of modulus one can be approximated to within $\epsilon $ by characters. $E$ is called a Sidon set if all bounded $E$-functions can be interpolated by the Fourier transform of measures on the dual group. As $% \epsilon $-Kronecker sets with $\epsilon \lt 2$ possess the same arithmetic properties as Sidon sets, it is natural to ask if they are Sidon. We use the Pisier net characterization of Sidonicity to prove this is true.

Keywords:Kronecker set, Sidon set
Categories:43A46, 42A15, 42A55

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