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We introduce a uniform way of classifying thin sets of harmonic analysis related to absolute convergence of trigonometric series. This classification covers classical classes (D, PD, A, V0, K) and yields two new ones (8o and 8). We study interrelation between these classes concerning combinatorial structure of thin sets. In 1938 J. Marcinkiewicz [8] introduced the notion of N-set (in honour of V. V. Niemytzki): a set X C [0,1] is an N-set iff there is a trigonometric series

A classification of trigonometrical thin sets and their interrelations