具有某种断面的半群的研究进展

本文综述了几类具有特殊断面的半群的近期研究结果。在介绍逆半群和正则半群的一般结构之后，概述了具有逆断面的正则半群的结构和同余格的研究成果。总结了作为逆断面的推广的可裂断面，纯正断面，正则^*－断面和恰当断面。提出了可以进一步研究的重要的问题。     

逆半群的基本矩形带的同余完备性

本文讨论了逆半群的基本矩形带上的完备同余，就若干特殊情形给出了这类半群是完备的充分必要条件。     

On E-solid Regular Semigroups With Inverse Transversals

Let S be a regular semigroup. An inverse subsemigroup S of S is called an inverse transversal if So contains an unique inverse x" for each x E S. In this case, I ~ {e E E(S)lee = e}and A = {g 6 E(S)gg = g}, are left and right regular subbands of S, respectively, where E(S)denotes the set of idempotehts in S. Denote E' = E(S). A regular semigroup S is calledE-solid if R|E(S) o LIE(S) = LIE(S) o R|E(s). A regular semigroup S is E-solid if and only ifthere is an inverse congruence…     

自由单演逆半群上的核—迹算子半群

对于逆半群上的同余ρ,在它的迹类中存在最大元ρT和最小元ρt.相应地,在它的核类中有最大元ρK和最小元ρk.因此,我们在S的同余格上得到四个算子Г={T,t,K,k}.本文将给出自由单演逆半群上,由算子半群Г生成的半群,即自由单演逆半群上的核一迹算子半群.     

关于具有$Q$-逆断面的正则半群的同余格

In this paper, a complete congruence on the congruence lattice of regular semigroups with Q-inverse transversals is analysed. The classes of this complete congruence which are intervals are discussed and their least and greatest elements are presented clearly.     

$*$-双单型$A \omega^2$-半群的同构定理

在本文中,我们研究了满足条件$D^*=D(~)$的*-双单型$A\omega^2$-半群的同构,给出了它们之间的同构定理.     

两类完备的正则半群

本文考察了两类完备的正则半群,确定了这两类半群的结构.     

Block Separating Congruence Lattices of E－bisimple Semigroups

In 1966, Reilly Characterized bisimple ω-semigroups as Bruck-Reilly extensions of Groups.Later, Munn and Reilly proved that a congruence on a bisimple ω-semigroup is a group congruence or is idempotent-separating. Many author investigated the congruences on Bruck-Reilly ex-