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1.
具有某种断面的半群的研究进展   总被引:1,自引:0,他引:1  
汪立民 《数学进展》2002,31(6):485-494
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。  相似文献   

2.
完全单半群及完全正则半群的逆断面   总被引:1,自引:1,他引:0  
朱凤林  刘卫江 《数学研究》2000,33(1):109-112
指出完全单半群S的任何一个F-类是逆断面,且为Q-逆断面,而S的任何一个逆断面必是一个F-类,因而所有逆断面同构。并且给出完全正则半群的逆断面存在的充要条件。  相似文献   

3.
正则左S-系是von neumann正则半群的自然推广,逆左S-系是逆半群的自然扩广,作为左逆半群的自然推广,本文引入了L-逆左系的概念,并用来刻画了几类幺半群,如左逆幺半群,逆幺半群,adequate幺半群等。  相似文献   

4.
具有拟理想正则*-断面的正则半群   总被引:4,自引:1,他引:3  
李勇华 《数学进展》2003,32(6):727-738
本文提出了具有正则*-断面正则半群的概念,所给出的例子表明具有拟理想正则*-断面的正则半群类真包含了具有拟理想逆断面的正则半群类和正则*-半群类;最后刻画了具有拟理想正则*-断面的正则半群的结构.  相似文献   

5.
半群断面的同构   总被引:1,自引:0,他引:1  
陈建飞  芮昌祥 《数学进展》2002,31(4):355-362
我们首先证明,若S^*,S^o是正则半群S的两个纯正断面,σ^*,σ^o分别是S^*,S^o上的最小逆半群同余,则商半群S^*/σ^o同构。作为上述结论的一个推论,重新获得:含逆断面的正则半群的所有逆断面均同构。关于富足半群我们证明了:满足正则性条件的富足半群若含有似理想恰当断面,则其所有拟理想恰当断面均同构。  相似文献   

6.
π-逆半群是广义正则半群,研究它的π-逆子半群格是非常自然的.本文首先讨论了一个π-逆半群的π逆子半群格的直积分解;然后通过引进πU-链的概念刻划了π-逆子半群格是模格的π-逆半群的性质及特征.  相似文献   

7.
本文分别给出Ⅱ正则半群的幂等元同余类和Ⅱorthodox半群的幂等元同余类的Ⅱ正则性刻画,其次,证明Ⅱ逆半群或完全Ⅱ逆半群或完全Ⅱ正则半群S的幂等元同余类是S的Ⅱ正则子半群。最后讨论orhtodox半群的幂等元同余类的正则性。  相似文献   

8.
本文引入并研究了左简纯正断面, 得到了与之相关的若干刻画; 推广并丰富了Blyth 和AlmeidaSantos 于1996 年得到的关于左简逆断面及Kong 于2007 年得到的关于纯正断面的相关结果; 同时,给出了具有左简纯正断面的正则半群的结构定理.  相似文献   

9.
本文证明了π-逆半群在其满幂π-正则子半群上的局部化在同构意义下存在唯一,且为其最大群同态象.由此可得π-逆半群的最小群同余.  相似文献   

10.
本文分别给出П正则半群的幂等元同余类和Пorthodox半群[1]的幂等元同余类的П正则性刻画.其次,证明П逆半群或完全П正则半群S的幂等元同余类是S的П正则子半群.最后讨论orthodox半群的幂等元同合类的正则性.  相似文献   

11.
朱凤林 《数学季刊》2003,18(2):198-204
A normal orthodox semigroup is an orthodox semigroup whose idempotent elements form a normal band.We deal with congruces on a normal orthodox semigroup with an iverse transversal .A structure theorem for such semigroup is obtained.Munn(1966)gave a fundamental inverse semigroup Following Munn‘s idea ,we give a fundamental normal orthodox semigroup with an inverse transversal.  相似文献   

12.
The notion of an inverse transversal of a regular semigroup is well-known. Here we investigate naturally ordered regular semigroups that have an inverse transversal. Such semigroups are necessarily locally inverse and the inverse transversal is a quasi-ideal. After considering various general properties that relate the imposed order to the natural order, we highlight the situation in which the inverse transversal is a monoid. The regularity of Green’s relations is also characterised. Finally, we determine the structure of a naturally ordered regular semigroup with an inverse monoid transversal.  相似文献   

13.
Let S be a locally inverse semigroup with an inverse transversal S°. In this paper, we construct an amenable partial order on S by an R-cone. Conversely, every amenable partial order on S can be constructed in this way. We give some properties of a locally inverse semigroup with a Clifford transversal. In particular, if S is a locally inverse semigroup with a Clifford transversal, then there is an order-preserving bijection from the set of all amenable partial orders on S to the set of all R-cones of S.  相似文献   

14.
15.
给出了具有Clifford断面的右正规纯正半群的等价刻画,得到了具有Clifford断面的正则纯正半群的次直积分解,证明了具有Clifford断面的正则纯正半群一定是正则纯正群.  相似文献   

16.
Using group congruences, we obtain necessary and sufficient conditions for an ordered E-inversive semigroup to be a Dubreil-Jacotin semigroup. We also determine when such a semigroup is naturally ordered. In particular, when the subset of regular elements is a subsemigroup it contains a multiplicative inverse transversal.  相似文献   

17.
朱凤林  宋光天 《数学杂志》2004,24(6):595-600
左半正规纯正半群是幂等元集形成左半正规带的纯正半群.本文讨论了具有逆断面的左半正规纯正半群上的一些性质;给出该类半群的一个构造定理。  相似文献   

18.
The so-called split IC quasi-adequate semigroups are in the class of idempotent-connected quasi-adequate semigroups. It is proved that an IC quasi-adequate semigroup is split if and only if it has an adequate transversal. The structure of such semigroup whose band of idempotents is regular will be particularly investigated. Our obtained results enrich those results given by McAlister and Blyth on split orthodox semigroups.  相似文献   

19.
We first consider an ordered regular semigroup S in which every element has a biggest inverse and determine necessary and sufficient conditions for the subset S of biggest inverses to be an inverse transversal of S. Such an inverse transversal is necessarily weakly multiplicative. We then investigate principally ordered regular semigroups S with the property that S is an inverse transversal. In such a semigroup we determine precisely when the set S of biggest pre-inverses is a subsemigroup and show that in this case S is itself an inverse transversal of a subsemigroup of S. The ordered regular semigroup of 2 × 2 boolean matrices provides an informative illustrative example. The structure of S, when S is a group, is also described.  相似文献   

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