机构地区: 华南师范大学南海校区学院数学系
出 处: 《华南师范大学学报(自然科学版)》 1995年第4期57-60,共4页
摘 要: 本文给出了正则半群幂等元同余类为正则的充要条件.对正则半群存在非正则幂等元同余类给出了一个刻划.并证明了对任意的n∈Z ̄+(n>6)都存在n阶正则半群,它具有非正则幂等元同余类。 In this paper,a necessary and sufficient condition for a congruence class of an idempotent to beregular and a characterization for which there exist non-regular congruence classes of idempotentson a regtilar semigroup are given.It is proved that for any n∈Z ̄+(n>6)there exists a regularseniigroup of order n such that it has non-regular congruence classes of idempotent.