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On the relationships between Fourier-Stieltjes coefficients and spectra of measures

Przemysław OhryskoMichał Wojciechowski — 2014

Studia Mathematica

We construct examples of uncountable compact subsets of complex numbers with the property that any Borel measure on the circle group with Fourier coefficients taking values in this set has a natural spectrum. For measures with Fourier coefficients tending to 0 we construct an open set with this property. We also give an example of a singular measure whose spectrum is contained in our set.

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