共查询到20条相似文献，搜索用时 93 毫秒
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秦松涛 《湘潭师范学院学报(社会科学版)》2000,21(6):27-30
在定义了R^2的单调范数以后,得到了RS集对两个最佳元逼近的新特征。当X是p一致凸Banach空间,证明了凸集对两个元的最佳同时逼近必是 p阶强唯一的（p＞1）。 相似文献
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本文在一类具有中间性和强中间性的集M上考虑了如下的极小化问题: inf‖F(x,Q)‖得到了极小化解的特征刻划和唯一性定理。利用这些结果,我们得到了通常的单边联合最佳逼近的一些结论。本文的结果推广了文[5] 中的某些结论。 相似文献
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本文在一般线性赋范空间内提出点集的最小偏离问题,给出了最小偏离点的存在性与唯一性的各种充分性判据及其对于最佳逼近元唯一性问题的应用. 相似文献
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设■与■分别表示线性赋范空间（X,‖·‖）的对偶空间（X,‖·‖）的强拓朴与弱拓朴.本文利用凸集的隔离定理证明了Mazur定理及凸集的最佳逼近元存在性定理的对偶定理。同时证明了:对X中的凸集G,当X是可分Banach空间时,有 相似文献
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研究连续函数的最佳Chebyshev指数逼近问题,得到了最佳逼近的存在性、唯一性及特征性等方面的结果,揭示了最佳Chebyshev指数逼近与人们熟知的Chebyshev多项式逼近有极其相拟的特征性质． 相似文献
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本文在局部Haar条件下，讨论了紧空间上非线性Dunham型Chebyshev同时逼近，得到了同时逼近为局部最佳的充分必要条件，给出了与非线性同时逼近问题等价的相关线性同时逼近问题；证明了极小集的存在性，在这个极小集上的局冲淡最佳逼近为局部最佳的；获得了区间上非线性同时逼近的交错定理；证明了非线性同时逼近的a阶（a≥1)的强唯一常数等于其相关线性同时逼近的a阶强唯一常数。 相似文献
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本文讨论了Orlicz空间中的联合最佳逼近问题，得到了Orlicz模和Luxemberg模联合最佳逼近的特征定理、唯一性定理和存在定理。 相似文献
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本文讨论了局部Haar条件下变形的非线性L逼近，得到了包括交错定理在内的特征定理、唯一性和强唯一性定理。 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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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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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 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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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 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