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在Banach空间中,给出了平均非扩张映射‖Tx-Ty‖≤a‖x-y‖+b‖x-Ty‖的Ishikawa迭代收敛的充要条件,所得结果改进和推广了平均非扩张映射的Ishikawa迭代收敛的性质. 相似文献
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吴建春 《商丘职业技术学院学报》2011,(5):3-5
^∑sam具有较慢的收敛速度.K=O(1)时,在范数‖·‖∑下,∑的收敛速度为n^-β/2,其中β=min(1,2-α),而^∑sam则具有较慢的收敛速度n^-β1/2. 相似文献
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高‖校‖物‖理‖课‖教‖学‖改‖革‖浅‖议●鞍山钢铁学院数理系温传庚王开明●关键词:课程现代化素质(一)要突出工科物理的风格。使学生对工科物理的内容和方法、工作语言、概念和物性图象,其历史、现状和前言等方面,从整体上有个全面了解,使工科物理不仅为后继... 相似文献
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利用不动点定理将n阶线性方程组X=Cx+d在范数‖·‖1的列范数下解的存在性与唯一性推广至范数‖·‖1的行范数、范数‖·‖p和范数‖·‖∞,并将这一性质推广至无限阶线性方程组. 相似文献
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设T是一希尔伯特空间算子,T=A iB,其中AB是自伴算子。利用一类qusi-范数不等式及范数不等式,比较了‖T‖p与‖(A2 B2)1/2‖p和(‖A‖pp ‖B‖pp)1/p之间的关系,得到当2≤p≤∞,‖A‖pp=‖B‖pp≤‖T‖pp≤2p-2(‖A‖pp ‖B‖pp);21/p-1/2‖(A2 B2)1/2‖p≤‖T‖p≤21-1/2‖(A2 B2)1/2‖p,进而得到特殊情况‖T‖22=‖A‖22 ‖B‖22和‖T‖2=‖(A2 B2)1/2‖2,它们反眏了‖.‖2的Euclidean特点。 相似文献
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通过对含有几何常数C的拟赋范线性空间中的映射vx,y(t)=(‖x+ty‖-‖x‖)/t的研究,得到了vx,y映射在拟赋范线性空间中所满足的不等式,并且在进一步论证过程中得到了关于拟赋范线性空间三角不等式‖x+y‖≤C‖x‖+C‖y‖的推广。 相似文献
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本文在Lp(X,dμ)上定义非对称范数‖f‖p,(α,β),并在此基础上给出了非对称范数意义下Hardy-Little-wood极大算子的性质. 相似文献
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孟一梅 《湖州师范学院学报》2011,33(2):17-20
H(B)是单位球B上的全纯函数的全体,对g∈H(B),讨论了Bloch空间上的广义Cesàro算子Tg的本性模估计.利用上极限,给出了‖Tg‖e,B→B的表示.此处‖Tg‖e,B→B表示Bloch空间上的广义Cesàro算子的本性模. 相似文献
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张华珍 《荆门职业技术学院学报》2010,25(5):39-43
文章讨论子矩阵约束下‖AX-Z‖2+‖YHA-WH‖2=min的广义中心对称解及其最佳逼近,给出了解存在的充要条件及通解的表达式,并且给出了解集合中与给定矩阵的最佳逼近。 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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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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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