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周异辉 《南阳师范学院学报》2012,(3):12-14,23
在对双Quantale模基本性质研究的基础上,讨论了双Quantale模范畴中的余极限,给出了余极限的基本结构,证明了双Quantale模范畴的余完备性,这是对已有双Quantale模范畴性质的完备和补充. 相似文献
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同余是数论中非常重要的一个概念，是数论的语言，与整数有关的问题常常要用到它。
同余的概念是建立在带余除法的基础之上的，首先我们来看看带余除法的定义。 相似文献
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本文讨论了双循环半群S上的同余,给出了S的幂等元半格E=Cω上的同余τ是正规同余当且仅当τ=ωE,且.满足trρ=ωE的同余中最大的同余是ωS,最小的同余是ωτ,即S的群同余类区间为[ωτ,ωS]. 相似文献
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探讨了余代数上的若干性质,研究了基本余代数的同调性,利用余代数变换这个工具重点研究了遗传余代数的同调性,并给出了几个结论． 相似文献
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同余是研究半环结构的主要工具,而分配格是一类特殊的半环．文章主要借助文献[3]中的方法,定义交换分配半环上的一个同余。并且验证该同余是最小分配格同余． 相似文献
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文[1]中给出了由同余三元组对带逆断面的一般正则半群同余的刻画。本文给出了对文[1]中定理4．3证明的一点补充。由于纯正半群的幂等元集构成子半群，本文对带逆断面的纯正半群的同余给出了一个刻画，它是文[1]中定理4．3的细化。本文还用逆断面刻画了带逆断面的纯正半群的最小群同余，它是文[8]中定理3．1的自然推论。 相似文献
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一元一次同余方程的求解关键在于求解有唯一解的一元一次同余方程 ,利用同余的概念、同余的性质、余数定理等 ,可得到有唯一解的一元一次同余方程的五种求解办法 相似文献
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史璟 《西南师范大学学报(人文社会科学版)》2011,(4):87-93
近年来,余代数成为国际逻辑学界研究的热点之一。余代数的基本理论建立于范畴论基础之上,而范畴论是关于对象和对象之间的箭头的理论,它是比集合论更加抽象、更加具有一般性的理论,因此余代数也就成为非常抽象的数学结构。从广义上说,余代数处理基于状态的动态系统,比如理论计算机科学中的（加标）转换系统、模态逻辑的模型和框架等等,它是基于状态的动态系统的抽象模型。本文首先介绍余代数的基本概念,然后论述它在非良基集合论研究中的起源,接着说明余代数与模态逻辑的联系。最后,余代数提供了一种处理模态逻辑语义的抽象模型,因此具有十分广泛的应用。 相似文献
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利用n-余表现模定义了模M的n-余表现维数COPnd(M),刻画了右n-余凝聚环,即R为右n-余凝聚环当且仅当对于任意右R-模M,均有COPnd(M)=COPn+1d(M),并研究了在环扩张下模的n-余表现维数的若干关系式。 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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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 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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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 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