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给出了次正定矩阵广义Schur补的一个偏序和一个行列式不等式,并将正定厄米特矩阵的一个不等式推广到次正定矩阵广义Schur补上. 相似文献
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半正定矩阵与正定矩阵在不等式的研究上有相当大的区别,将正定矩阵推广至半正定矩阵,需要用Moore Penrose 逆来代替一般的逆.利用分块矩阵和Schur补得到了关于半正定矩阵Moore-Penrose逆的Hadamard积的几个偏序不等式. 相似文献
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尹小艳 《咸阳师范学院学报》2004,19(2):11-12
研究了矩阵的广义Schur补问题.给出了矩阵广义Schur补的一个极小表示及其特征值的一个关系式。得到了矩阵乘积广义Schur补的一个不等式。 相似文献
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宋乾坤 《湖州师范学院学报》2003,25(6):9-11
给出了n阶复矩阵的广义Minkowski行列式的两个不等式:Idet(A B)1α≥2-sa/2(IdetAα IdetB1α),其中A是n阶复半正定矩阵,B是n阶正定Hermite矩阵,a≥1/n,S是B^-1A的复特征值的个数;Idet(A B)I。≥(IdetAI。 IdetBI。),其中A和B是n阶复半正定矩阵,且它们的特征值全为实数,r([A,B])≤1,a≥1/n,改进和推广了已有的结果。 相似文献
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文章将对正定复矩阵的Schur补、k阶主子阵、Kronecker积和Hadamard积Sylvester阵的正定性进行讨论 ,给出一系列重要结论 ,证明了A ,B是正定复矩阵、半正定复矩阵 ,A与H(B)的kronecker乘积、A H(B)是正复矩阵、半正定复合矩阵这一重要结论。 相似文献
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对正定复矩阵的Schur补的行列式模的估计进行了研究,给出κ—局部完全对称正定复矩阵与正定Hermite矩阵和的Schur补的行列式模的一个估计不等式||(A B)/(A B)κ||^2/n-κ≥||A/Aκ||^2/n-κ |B/Bκ|^2/n-κ本结论主要采用了“挖去”方阵中未必对称的部分,充分利用局部对称性的思想方法进行了证明。 相似文献
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利用矩阵Schur补的性质,建立了若干关于半正定矩阵Hadamard乘积和普通加法的矩阵不等式,推广了相应的结果. 相似文献
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利用分决矩阵和Schur补得到了关于半正定矩阵Moore-Penrose逆的若干矩阵等式和矩阵不等式,相应地推广了某些已知结果. 相似文献
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半正定自共轭四元数矩阵之和的行列不等式 总被引:1,自引:0,他引:1
张锦川 《泉州师范学院学报》2001,19(2):4-8
给出二半正定自共轭四元数矩阵之和及其矩阵Schur补的行列式不等式,推广与改进了相应的复矩阵结果。 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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《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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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献