In this paper,we study abundant quasi-ideals on type- A semigroups. We prove that there exists an idempotent-separated good congruence on an abundant quasi-ideal of a type-A semigroup S, which can be extended to an idem- potent-separated good congruence on S.
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李春华.拟理想与型-Α半群[J].华东交通大学学报,2005,(5):144-146. LI Chun-hua. Quasi-ideals and Type A Semigroups[J]. JOURNAL OF EAST CHINA JIAOTONG UNIVERSTTY,2005,(5):144-146