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A hierarchy of thin sets related to the boundedness of trigonometric series
Authors:Peter Elias
Affiliation:Mathematical Institute, Slovak Academy of Sciences, Jesenná 5, 041 54 Kosice, Slovakia
Abstract:

We study the family  $mathcal{B}_0$ of the sets on which some series of the form $sum_{kin{Bbb N}}leftvertsinpi n_kxrightvert$ is uniformly bounded. We show that the families  $mathcal{B}_0^c$ of all sets admitting the boundary $c$ form a hierarchy which is incontinuous with respect to the operations of intersection and union.

Keywords:Trigonometric thin sets   N$_0$-sets   B$_0$-sets   uniform boundedness
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