\(\mathcal{H}\)- and \(\mathcal{R}\)-cross-sections of the full finite semigroup \(T_n\)

Abstract

All \(\mathcal{H}\)- and \(\mathcal{R}\)- cross-sections of the full finite semigroup \(T_n\) of all transformations of the set \(N = \{1, 2, . . . , n\}\) are described.