On Some Subsemigroups of Transformation Semigroup
Qin Mei-qing · Journal of Qufu Normal University · 2011
Let Xn be a set.P(Xn) denote the semigroup that transformed by the upper part of set Xn.A kind of subsemigroup that generate by a subset of partial transformation semigroup is researched and some properies of this kind semigroup ore discussed by the definition.Necessary and sufficient conditions for this semigroup to be left zero semigroups,right zero semigroups,completely simple semigroups are given.Our results genralize some known results.