C-wrpp半群的平移壳

The Translational Hull of a C-wrpp Semigroup

一个半群叫C-wrpp半群,如果每一个L**-类包含至少一个幂等元且幂等元是中心。研究C-wrpp半群的平移壳,证明C-wrpp半群的平移壳仍是C-wrpp半群。

A semigroup is called a C-wrpp semigroup if （i） each L^＊＊-class contains an idempotent and （ii） the idempotents are central. It is proved that the translational hull of a C-wrpp semigroup is still a C-wrpp semigroup.