$\mathcal{H}$- 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.