共查询到20条相似文献，搜索用时 140 毫秒
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杨燕 《商洛师范专科学校学报》2013,(4):40-42
半群S称为E-反演半群,如果对于S中的每-个元素α,存在α∈S,使得ax是S的幂等元。半群S称为E-稠密半群,如果S是E-反演半群并且幂等元相乘可交换。利用E-稠密半群局部化的结论,给出了E-稠密半群上的最小群同余的-个表示及若干等价刻画。在对强仃-逆半群和逆半群上-些结果进行推广的同时,也获得了强仃-逆半群和逆半群上最小群同余的-些新的结论。 相似文献
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证明了含幺Clifford半群上的Rees矩阵半群S的所有逆断面都是Q-逆断面,S的所有逆断面互相同构并且S的Q-逆断面是它的完全单子半群的Q-逆断面的强半格． 相似文献
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运用有限集Ｘ上的变换半群ζ（Ｘ）的逆子半群的结构特征和含零元的极大逆子半群的结构特征，证明了ζ（Ｘ）中存在着一个由幂等元半格同构的极大逆子半群构成的系列，并由此找出了这个系列。 相似文献
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在Clifford半群的nil-扩张中引入了正规子半群的概念,利用正规子半群给出了Clifford半群的nil-扩张上的同余子半群的概念．以同余子半群作为工具,构造了Clifford半群的nil-扩张上的群同余,最后证明了当一个Clifford半群A的幂等元集E（A）存在最小元eo时,A的nil-扩张S上的群同余和eo所在的H类的nil-扩张上的群同余是同构的． 相似文献
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含逆断面半群的等价刻划 总被引：1，自引：0，他引：1
本文引入一种格林关系，0-格林关系，采用Lawson提出的研究正则半群的新的研究方法一整体逆扩张（enlargement），对含逆断面半群进行研究，给出了含逆断面半群的等价刻划，证明了S^0是S的一个逆断面当且仅当P={e∈S；（Зe’∈V（e）∩S^0）ee’=e}中每个元素的R^0-类只含一个幂等元，Q={f∈S；（Зf＇∈V（f）∩S^0）ff=f}中每个元素的L^0-类只含一个幂等元． 相似文献
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文献[1]证明了半群S含有极小I-稠密子集的充要条件是S满足弱I-极小条件 在此基础上进一步证明了半群S含有有限I-稠密子集的充要条件是S满足I-链条件,并由此还得到一个半群是Artin半群的充要条件 相似文献
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本文证明了当半群S的幂等元集为右正则带时，S的左拟内射性与左内射性是一致的；进而证明了半群的内射性与内射性是一致的。 相似文献
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引入半群S模糊左理想集的概念,讨论了它的一系列性质,证明了半群S的左理想的全体及模糊左理想集全体均做成一个格,并且同构. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 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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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 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