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1.
在保持非负定性不变的前提下,本文对矩阵每一元素容许多大的扰动作了进一步的研究, 将本文的结论和C.R.Johnson提出的部分正定阵的正定完备化进行比较,容易发现对已知的正定矩阵求扰动,本文的结论比用C.R.Johnson的正定完备化计算扰动形式上更简单,同时也给出了不同于C.R.Johnson的部分正定阵的正定完备化表示的另外一个公式,推出了这些正定完备化矩阵应具有的若干性质. 相似文献
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给出了泛正定矩阵的重要性质与充要条件.进而提出了新的泛正定与泛非负定矩阵子集类的定义.在其基础上给出泛正定子集类的一系列性质,尤其是推广了Minkowski不等式.最后讨论了泛非负定子集类上的一种新的矩阵偏序的性质与充要条件. 相似文献
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本文对被屠伯埙称为亚正定的矩阵类进行了推广,即给出了(n,1)-广义正定矩阵的概念,进而得到了(n,1)-广义正定矩阵的一系列性质,最后将关于正定阵的Hadamard乘积的Schur定理及华罗庚定理推广到(n,1)-广义正定矩阵. 相似文献
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M. Oberguggenberger D. Scarpalézos 《Journal of Mathematical Analysis and Applications》2007,328(2):1321-1335
The definitions of positivity and positive definiteness are extended to generalized function algebras in coherence with the corresponding notions for distributions. Versions of Bochner's theorem for a positive definite Colombeau generalized function are given. 相似文献
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This paper deals with conditionally positive definite kernels on Euclidean spaces. The focus here is on dot product kernels, that is, those depending on the inner product of the variables. Among the results, we include some properties relating conditional positive definiteness and standard convolution in the line and also results related to the characterization of the conditionally positive definite dot product kernels with respect to finite-dimensional polynomial spaces. We also introduce and characterize two large classes of strictly conditionally positive definite dot product kernels. 相似文献
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本文推广了文[1]的主要定理,给出了用低阶矩阵判定高阶矩阵正定的判定定理,同时给出了矩阵方程AX=B的反问题在正定矩阵类中解存在的充要条件及解的一般形式. 相似文献
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文[1-5]中研究了对称、对称半正定及流形上的对称半正定的反问题,并说明了其应用背景.本文研究线性流形上的正定及半正定阵的反问题,说明了文[1-3]中的一些结果为本文的特例. 相似文献
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本文给出了四次函数实零点的完全判据和正定条件,这一结果在研究多项式系统的奇点分析和分支问题时给出了可以实用的判据. 相似文献
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In this paper, some necessary and sufficient conditions for the existence of the positive definite solutions for the matrix equation X + A*X?αA = Q with α ∈ (0, ∞) are given. Iterative methods to obtain the positive definite solutions are established and the rates of convergence of the considered methods are obtained. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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蒋忠樟 《数学的实践与认识》2007,37(15):174-179
实对称正定矩阵的复合矩阵正定性的研究已有结论,但对于一般意义下的正定矩阵的复合矩阵是否仍然是正定的研究需要利用一般的正定矩阵的标准形的复合矩阵进行讨论,给出了一般公式及具体算法,为讨论其复合矩阵的正定性提供了基础条件. 相似文献
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本文讨论了实正定矩阵的复合矩阵的正定性,并且给出了实正定矩阵的复合矩阵仍为正定矩阵的一个充要条件. 相似文献
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Hua Dai 《计算数学(英文版)》2004,22(5):671-680
Let $P$ be an $n\times n$ symmetric orthogonal matrix. A real $n\times n$ matrix $A$ is called P-symmetric nonnegative definite if $A$ is symmetric nonnegative definite and $(PA)^T=PA$. This paper is concerned with a kind of inverse problem for P-symmetric nonnegative definite matrices: Given a real $n\times n$ matrix $\widetilde{A}$, real $n\times m$ matrices $X$ and $B$, find an $n\times n$ P-symmetric nonnegative definite matrix $A$ minimizing $||A-\widetilde{A}||_F$ subject to $AX =B$. Necessary and sufficient conditions are presented for the solvability of the problem. The expression of the solution to the problem is given. These results are applied to solve an inverse eigenvalue problem for P-symmetric nonnegative definite matrices. 相似文献
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§1. IntroductionInthestudyofdifferentialequationsandothermathematicalfields,oneusuallyneedtodealwiththepositivedefinite,negativedefiniteproblemsofbinaryquarticforms,see[1,2].Itiswell-knowthatinthecaseofquadraticform,thereexistmanycriterionsfortheposi… 相似文献
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Aleksandr O. Ignatyev 《Journal of Mathematical Sciences》2013,190(4):567-588
The short survey of studies of the asymptotic stability with the help of auxiliary functions (positive definite and nonnegative) whose derivatives are nonpositive by virtue of the equations of perturbed motion and the construction of positive definite Lyapunov functions with negative definite derivatives on the basis of these auxiliary functions is given. The example of the construction of the Lyapunov function with the use of an auxiliary nonnegative function with nonpositive derivative is presented. 相似文献
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In this paper we give out a sufficient and solution of quadratic function's maximum with theory of quadratic form and give out the definition of the positive definite property of the following homogeneous polynomials of degree In two variables function, based on the definite of local maximum of two variables function. 相似文献