矩阵方程X~α+A*X~(-β)A=I的Hermite正定解

研究了矩阵方程Xα+A*X-βA=I的Hermite正定解的存在性问题。首先,给出矩阵方程有解的充分必要条件,即存在一个Hermite正定阵M,使得矩阵A满足如下的分解:A=(M*M)β2αN;其次,在所得结论的基础上,利用CS分解定理,得到矩阵方程有解的另一个充分必要条件:存在酉矩阵P、Q以及对角矩阵C0,D≥0,使得A=P*CβαQDP,其中C2+D2=I,CP=PC,此时方程的解可表示为X=(P*C2 P)1α;最后利用Brouwer不动点定理,证明若‖A‖≤βα+β+(αα+β)阵方程在区间[βα+βI,I]上有解X。     

非奇M-矩阵的判定准则

给出了非奇M -矩阵新的判定定理.利用矩阵B=A +AT 满足新的判定定理的条件 ,得出矩阵A为非奇M矩阵的结论 ,推广了已有的判定定理.实例说明 ,采用该定理可以较为容易地得出判定结果     

椭球等高矩阵分布族中EVS_(n×p)(M,Σ,ψ)的一些结果

对一类椭球等高矩阵分布X =M+RU3A～EVSn×p(M ,Σ ,ψ) ,A′A =Σ>0 ,Vec(U3) =d u(np) ,从条件分布、边缘分布两方面讨论了与矩阵正态分布的关系及其二次型分布 ,得到了关于EVSn×p(M ,Σ ,ψ)的一些结果 .     

椭球等高矩阵分布族中 EVSn×p(M，∑，ψ)的一些结果

对一类椭球等高矩阵分布X=M+RU3A～EVSn×p(M,∑,ψ),A＇A=∑ >0,vec(U3)d＝u(np,从条件分布、边缘分布两方面讨论了与矩阵正态分布的关系 及其二次型分布,得到了关于EVSn×p(M,∑,ψ)的一些结果．     

幂等矩阵线性组合的非奇异性

幂等矩阵是矩阵理论中一类特殊的矩阵,它具有良好的性质和实际应用。利用分块矩阵给出幂等矩阵线性组合非奇异性的充分必要条件。证明了A1+A2是非奇异的当且仅当T是非奇异的;A1-A2是非奇异的当且仅当T是非奇异的且M=NT-1H当且仅当T与Ir-M都是非奇异的。     

二元外代数对应的线性矩阵问题

设((￡)(M))是对应于二元外代数A=k/(x2,xy+ yx,y2)的线性矩阵问题,利用Belitskii算法得到(M)(n)中的(n)×(n)不可分解矩阵在(￡)(n)-相似变换下的典范形的具体形式.     

两类特殊S0-模糊传递矩阵的收敛性

定义了两类特殊的S0-模糊传递矩阵,讨论它们的收敛性.首先定义了Sz-模糊传递矩阵,证明了对任意n阶Sz-模糊传递矩阵A有An=A2n=A3n=….其次定义了Z0-模糊传递矩阵,证明了对任意n阶Z0-模糊传递矩阵A,A(n-1)2+1中元素全是非零元,并给出A(n-1)2+1=A(n-1)2+2=…成立的充分条件以及振荡周期PA=n-1的充分条件.     

求解矩阵方程A1XB1+A2XTB2=E的一般解

将矩阵方程A1XB1+A2XTB2=E解表示问题转化为对子矩阵块约束下矩阵方程AYB=E对称解表示问题。应用矩阵的Kronecker积、矩阵广义逆、广义奇异值分解等理论给出矩阵方程A1XB1+A2XTB2=E解的表示。     

关于M-矩阵的最小特征值

讨论了不可约M 矩阵的最小特征值问题,得出若A,B∈Rn×n是不可约M 矩阵,则存在正对角矩阵D1=diag(d1,…,dn)与D2=diag( d1,…, dn),使得D1A-1D2是双随机矩阵且 dk bkk,其中B-1=[ bij].以此结论为工具对某已有结果作出改进;并研究了dkl(A B-1)>min1≤k≤nM 矩阵A的Hadamard幂A r,在r取奇数时,得出lr(A)≤l(A r);还讨论了M 矩阵A的主子矩阵 A,得出l( A)≥l(A).     

加边矩阵的非奇异性

设A为m×n矩阵,rankA=r相似文献   

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has