COMBINATORIAL RESULTS FOR SEMIGROUPS OF ORDER-PRESERVING FULL TRANSFORMATIONS WITH PATTERN OF RANGE
Phichet Jitjankarn · International Journal of Pure and Apllied Mathematics · 2013
Let O[n] and C[n] be the semigroup of all order-preserving and all order-preserving and regressive transformations on the set [n] = {1, . . ., n}, respectively.In this paper, we give a pattern on [n].Combinatorial properties on subsemigroups of O[n] with restricted range to the pattern are investigated.