Combinatorial results for certain semigroups of order-preserving full contraction mappings of a finite chain

A. D. Adeshola, A. Umar

Let ${\mathcal{T}}_n$ be the full symmetric semigroup on $X_n=\{1,2,...,n\}$ and let ${\mathcal{O}\mathcal{C}\mathcal{T}}_n$ and ${\mathcal{O}\mathcal{R}\mathcal{C}\mathcal{T}}_n$ be its subsemigroups of order-preserving and order-preserving…