节点文献
拟正则半群的同余和性质
Congruences and Characters on π-Regular Semigroups
【作者】 夏保芹;
【导师】 张玉芬;
【作者基本信息】 山东师范大学 , 基础数学, 2007, 硕士
【摘要】 本文主要讨论了GV-半群的某些性质和同余,把完全正则半群的某些结果推广到了GV-半群上,全文共分两章,具体内容如下:第一章主要讨论了GV-半群的某些性质。首先给出了GV-半群中当广义格林关系H~*为同余时的等价条件:(1) S是π-密码的;(2) S是π-群的带;(3) S满足等式r(ab)~0=r(r(a)~0r(b)~0)~0。然后给出了当GV-半群S=(?)S_α的幂等元集合E(S)是子半群时的某些性质,即GV-纯正半群的性质:(1)任意α∈Y,S_α是矩形群的nil-扩张;(2)幂等元集E(S)是自共轭的;(3)任意e∈E(S),V(e)(?)E(S);(4) S满足等式,r(a)~0r(b)~0=r(r(a)~0r(b)~0)~0;(5)任意a,b∈S,V(r(b))V(r(a))(?)V(r(a)r(b))。接着讨论了GV-半群上当同余ρ是幂等纯同余时,S/ρ的纯正性、E-酉性与S的纯正性、E-酉性的关系。最后一节讨论了完全阿基米德半群的某些性质。第二章主要讨论了GV-半群的某些同余。首先研究了π-正则半群上的群同余,它是正则半群的核和基的思想的推广,定义了π-正则半群的同余子半群:π-正则半群S的子半群K是同余子半群,若K满足是满的、自共轭的、酉的。利用同余子半群K构造了S上的群同余ρk:(a,b)∈ρk(?)存在x∈RegS,使ax,bx∈K。本章第二节首先描述了矩形群的nil-扩张S的最小群同余ρ:(a,b)∈ρ(?)存在e∈E(S),使eae=ebe。然后利用每一个矩形群的nil-扩张的最小群同余构造了特殊的GV-半群—矩形群的nil-扩张的半格的最小Clifford-半群同余,设S=(?)S_α,ρ_α是S_α上如上定义的最小群同余,则可定义S上的最小C-半群同余ρ:(a-b)∈ρ(?)存在α∈Y,使a,b∈S_α,且(a,b)∈ρ_α,从而也得到了左群的nil-扩张的半格,右群的nil-扩张的半格的最小C-半群同余。最后一节利用第一节构造的每一个S_α上的群同余ρ_α构造了GV-半群S=(?)S_α上的Clifford-半群同余,主要结果是:S=(?)S_α是GV-半群,ρ_α是如第一节中定义的S_α上的群同余,由(?)ρ_α生成的同余记作σ,则σ是S上的Clifford-半群同余。反之,若ρ为GV-半群S=(?)S_α上的Clifford-半群同余,令ρ_α=ρ|S_α,则ρ_α为S_α上的群同余,且<(?)ρ_α>(?)ρ。特别地,ρ=<(?)ρ_α>(?)ρ保持J~*关系。
【Abstract】 In this dissertation, we mainly describe some congruences and characters onGV-semigoups, in fact, we extend some results of completely regular semigroup toGV-semigroups.There are two chapters in this paper.In the first chapter, we investigate some characters on GV-semigroups.Firstly;wegive the equivalent condition ouπ-cryptogroup as follows:(1) S isπ-cryptic:(2) S is a band ofπ-groups:(3) S satisfies the identity r(ab)0 = r(r(a)0r(b)0)0.Secondly, we give some characters on GV-semigroups S=(?) Sa when theset of idempotents E(S) is subsemigroup. that are the characters of GV-orthodoxsemigroups:(1) for anyα∈Y, Sαis a nil-extension of rectangular group:(2) the set of idempotents E(S)is selfconjugate;(3) for any∈E(S), V(e)(?)E(S);(4) S satisfies the identity r(a)0r(b)0=r(r(a)0r(b)0)0;(5) for any a, b∈S, V(r(b))V(r(a)) (?)V(r(a)r(b)).Lastly, we discuss the orthodoxy and E-unity between S/ρand S whenρis anidempotent pure congruence. The last section discuss some characters on completelyarchimedean semigroups.In the second chapter, we deal with some congruences on GV-semigroups.In the first section we discuss the group congruence onπ-regular semigroups,it is theextension of kernel and trace on regular semigroups.First we give the definitionof congruence subsemigroup onπ-regular semigroup:if K is full,selfconjugate andunitary.Given such a congruence subsemigroup,we characterize group congruenceρkon S:(a, b)∈ρk(?)There exist x∈RegS with ax, bx∈K.The second section give the least group congruenceρon nil-extension of rect-angular groups:(a,b)∈ρ(?)There exist e∈E(S)with eae=ebe.Then we characterize the least Clifford-semigroup congruence on semilatticeof nil-extension of rectangular groups S by least group congruence on nil-extensionsof rectangular groups, that is,if S=(?) Sα·ραis the least group congruence on Sα.then the relationρdefining as follows is the least Clifford-semigroup congruence onS:(a, b)∈ρ(?)There existα∈Y with a,b∈Sα, and (a,b)∈ρα.We also get the least Clifford-semigroup congruence on semilattices of nil-extensions of left groups and semilattices of nil-extensions of right groups.The last section characterize Clifford-semigroup congruence on GV-semigroupS=(?) Sαby giving the group congruence on Sα, The main result is:S=(?) Sαis a GV-semigroup,ραis group congruence on Sαas the definitionof the first section,thenσ=<(?)ρα> is the Clifford-semigroup congruence.Ifρis Clifford-semigroup congruence on GV-semigroup S=(?) Sα, letρα=ρ|sα, thenραis group congruence on Sα,and <(?)ρα>(?)ρ.Particularly,ρ=<(?)ρα>ifand only if aρb(?)aJ*b.
【Key words】 GV-semigroups; nil-extensions of rectangular group; congruence;
- 【网络出版投稿人】 山东师范大学 【网络出版年期】2007年 05期
- 【分类号】O152.7
- 【被引频次】3
- 【下载频次】55