共查询到20条相似文献，搜索用时 109 毫秒
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关于YJ-内射模与强正则环的刻画 总被引：1，自引：0，他引：1
雷震 《洛阳师范学院学报》2006,25(5):1-3
令N(R)={x|x2=0,x∈R},记“环R满足(*)”如果对于任意的a∈N(R),元a的左零化子是环R的双边理想.本文目的是研究满足(*)的环的von Neumann正则性,证明了:若环R满足(*),则下列条件是等价的:(1)R是强正则的,(2)R的每一个极大的本质的右理想是YJ-内射的右R-模,(3)R为右GP-V-环,且每一个极大的本质的右理想为广义弱理想.(4)R为左GP-V-环,且每一个极大的本质的右理想为广义弱理想. 相似文献
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利用ZC-环和自-内射环的性质来刻画强正则环.证明了下列结果:1设R是ZC-环,下列条件等价:(1)R是强正则环;(2)R的每一个极大本质左理想是GP-内射的;(3)R中存在一个忠实左R-模K,使得当k∈K且l(k)本质时,l(k)是GP-内射的.2设R是ELT-环,且对于R的每一个本质左理想M,[R/M]R是平坦模,R的每一个补左理想是GW-理想,如果R是左MI-环,那么R是左自-内射强正则环. 相似文献
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设R是一个环 ,如果对于任意的x ,y∈R ,有xy -yx∈C(R) ,那么下列条件等价 :( 1 )R是强正则环 ;( 2 )R是VonNeumann正则环 ;( 3)R是广义正则环 .设R是半可换环 ,则以下条件等价 :( 1 )R是强正则环 ;( 2 )R的每一个极大的本质的左理想是左GP -内射模 ;( 3)R的每一个极大的本质的右理想是右GP -内射模 . 相似文献
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弱M-Armendariz环(英文) 总被引：1，自引：0，他引：1
对于幺半群M,引入了弱M-Armendariz环的概念,此概念是M-Armendariz环和弱Armendariz环的共同推广.研究了这类环的性质,并且证明了:R是弱M-Armendariz环当且仅当对任意的n,R的n阶上三角矩阵环Tn(R)是弱M-Armendariz环:如果I是环R的半交换理想,使得R/I是弱M-Armendariz环,则R是弱M-Armendariz环,其中M是严格全序幺半群;如果R是半交换的M-Armendariz环,则尺是弱MxN-Armendariz环,其中N是严格全序幺半群;有限生成Abelian群G是torsion-free的当且仅当存在一个环尺,使得R是弱G-Armendariz环. 相似文献
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《鞍山师范学院学报》1997,(4)
讨论BAND—分次环的性质,证明了:设R=(?)R_a是一个BAND—分次环,其中Ω为一个交换BAND,则R是Z—正则的(诣零的,拟正则的)当且仅当每—R_a是Z—正则的(诣零的,拟正则的). 相似文献
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杨璐 《洛阳师范学院学报》2012,(11):12-14
本文主要研究了EP-内射环的半本原性,正则性以及对EP-内射环作了进一步推广,主要得出如下结果:(1)如果R是PP-内射的左EP-内射环,则J(R)=0;(2)如果R是左EP-内射环且是左Bear环,则R是右非奇异的. 相似文献
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陈卫星 《南阳师范学院学报》2006,5(6):12-13
所讨论的环均是有单位元的结合环.本文称环R为GVNL-环,如果对任意的a∈R,a或1-a是π-正则的.证明了如果R是弱duo GVNL-环而S为R的非空子集,那么当S在R中生成的右理想(S)r=R时在S中必有一个元素是π-正则的. 相似文献
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设R是交换环,(S,≤)是严格全序幺半群.本文证明了:(1)广义幂级数环[[RS,≤]]是强GPP-环当且仅当R是强GPP-环,且B(R)(R的所有幂等元的集合)的任意S-加标子集C在B(R)中有最小下界.(2)如果(S,≤)满足条件:任意S∈S,s≥0,则环[[RS,≤]]是弱GPP-环当且仅当R是弱GPP-环. 相似文献
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《绵阳师范学院学报》2020,(2):4-6
设R是中心为Z(R)的2-扭自由σ-半素拟环,U￠Z(R)是R上的非零σ-Lie理想.若d是R上的导子(d与σ是可交换的),且d(U)=0,则d=0. 相似文献
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Wilfrid Bilodeau 《Interchange》1993,24(3):241-270
Résumé Cet essai évoque les contextes pédagogiques de l'écriture au-delà des formes d'écriture convenues en recherche, et questionne les usages scolaires de l'écriture. J'y suggère d'autres usages inspirés d'une approche qui inverse les rapports usuels entre communication et représentation, entre kinésis et mimésis. Cette approche vise une démystification du pouvoir de l'écriture à représenter le réel, à dominer la communication, et une promotion d'une écriture expressive et métaphorique, favorisant l'appropriation de cette technologie virtuellement libérante.Université Laval 相似文献
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Mother's Day--母亲节 Mother's Day falls on the second Sunday in May every year. This is the occasion we show appreciation to our mothers and to people who have worked so hard to take care of us. Today, I'm sharing thoughts from a friend about mother, love,and the study of English. When we were young students, a teacher touched our heart,and we all miss her very much on this special day in May. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Kate Lorenz 《海外英语》2007,(12):40-41
Whether your preferred destination is the executive suite or simply the nearest exit from your current position, don't let your job take you aimlessly down any path. In fact when it comes to career planning, don't think in terms of "jobs" at all, says corporate transitions expert William Bridges, Ph.D. Instead he suggests building your career plan on "doing the work you're best at for the employers who need it." 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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李晓劲 《读与写:教育教学刊》2008,5(6)
Public speaking, as one kind of speech act, the speaker uses some pragmatic strategies, for example,the use of personal pronoun, in order to achieve effective communication. Speakers use the first personal pro-noun we and the second personal pronoun you conventionally, also there are some deviations in the use of person-al pronouns. However, theses kinds of uses have to be explained and understood in such a specific context. 相似文献