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 On simple left, right and two-sided ideals of an ordered semigroup having a kernel Bull. Korean Math. Soc. 2014 Vol. 51, No. 4, 1217-1227 https://doi.org/10.4134/BKMS.2014.51.4.1217Published online July 1, 2014 Thawhat Changphas Khon Kaen University Abstract : The intersection of all two-sided ideals of an ordered semigroup, if it is non-empty, is called the kernel of the ordered semigroup. A left ideal $L$ of an ordered semigroup $(S,\cdot,\le)$ having a kernel $I$ is said to be simple if $I$ is properly contained in $L$ and for any left ideal $L'$ of $(S,\cdot,\le)$, $I$ is properly contained in $L'$ and $L'$ is contained in $L$ imply $L' = L$. The notions of simple right and two-sided ideals are defined similarly. In this paper, the author characterize when an ordered semigroup having a kernel is the class sum of its simple left, right and two-sided ideals. Further, the structure of simple two-sided ideals will be discussed. Keywords : semigroup, simple ordered semigroup, kernel, simple ideal, ideal, annihilator, radical, $I$-potent MSC numbers : Primary 06F05 Downloads: Full-text PDF