Browsing by Author "A. D. Adeshola and A. Umar"
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- ItemCombinatorial results for certain Semigroups of Order-Preserving full Contraction Mappings of a Finite chain(Combinatorial Press, 2018-06-01) A. D. Adeshola and A. UmarLet Tn be the full symmetric semigroup on Xn = f1; 2; : : : ; ng and let OCT n and ORCT n be its subsemigroups of order-preserving and order-preserving or order-reversing full contraction mappings of Xn, respectively. In this paper we investigate the cardinalities of some equivalences on OCT n and ORCT n which lead naturally to obtaining the orders of these subsemigroups. 1, 2,