121 citations
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math.RA2012★ 1 cited
A note on Isomorphism theorems for semigroups of order-preserving transformations with restricted range
Phichet Jitjankarn, Thitarie Rungratgasame
Finding necessary and sufficient conditions for isomorphism between two semigroups of order-preserving transformations over an infinite domain with restricted range was an open pro…
math.RA2011
A Classification of Regressive Transformation Semigroups on Chains
Patanee Udomkavanich, Phichet Jitjankarn
For each subchain of a chain , let denote the semigroup under composition of all full regressive transformations, satisfying …