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四元数矩阵的特征值与奇异值估计 总被引:9,自引:2,他引:7
In this paper, we give accurate estimation of eigenvalues and singular values of A + B,C*AC and AB, where A, B and C are quaternions matrices. These results improve and generalze the results in [4] and [5]. We also obtainsum (?),for k=1,…,n. Where A and B are self-conjugate quaternions matrices of order n, and λ1≥…≥λn,μ1≥μn,λ1,(A + B)≥…≥λn(A+B) be the eigenvalues of A,B and A + B, respectively. 相似文献
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探讨矩阵奇异值的性质及其与范数、谱半径、特征值等矩阵“大小”度量的关系,帮助学生建立这些概念之间的内在联系,强化对相关概念的理解和掌握. 相似文献
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合同下矩阵特征值与T合同下矩阵奇异值的估计 总被引:1,自引:0,他引:1
张玉海 《数学年刊A辑(中文版)》1996,(6)
本文讨论了 *合同下 Hermite矩阵的诸特征值及 T合同下对称矩阵 (实或复 )的诸奇异值的变化情况 ,给出的结果改进了 Sylvester,Ostrowski[1] 等人的相应结果 .另外 ,本文还得到了两 Hermite矩阵乘积的特征值和两复矩阵乘积的奇异值的估计 ,改进并推广了 Sha Huyn[3 ] 、郁易生[4 ] 、周金士[5] 等人的结果 相似文献
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四元数矩阵乘积的奇异值与特征值的不等式 总被引:2,自引:1,他引:1
本文给出了两个四元数矩阵乘积的奇异值的一些不等式,在此基础上估计了两个自共轭矩阵A、B的乘积的每个特征值,其中A≥0、B≥0或B>0. 相似文献
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用A表示复矩阵A的共轭转置矩阵。用λ_i(A)表示n阶复矩阵A的特征值,i=1,…,n对于n阶Hermite矩阵A,在没有特别指出的情况下,本文均约定A的n个(实)特征值按降 相似文献
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运用优化不等式理论和四元数体上的几何理论 ,得到了四元数矩阵积的特征值与奇异值的几个不等式 . 相似文献
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指出近期矩阵奇异值p-范数的讨论中一些值得商榷的问题.应用已有的半正定Hermitian矩阵特征值和迹的性质,我们研究了相关问题. 相似文献
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用Mn表示所有复矩阵组成的集合.对于A∈Mn,σ(A)=(σ1(A),…,σn(A)),其中σ1(A)≥…≥σn(A)是矩阵A的奇异值.本文给出证明:对于任意实数α,A,B∈Mn为半正定矩阵,优化不等式σ(A-|α|B) wlogσ(A+αB)成立,改进和推广了文[5]的结果. 相似文献
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则称S_A(B)为B对于A的谱改变量.当A为可正规化矩阵时,[2]中给出了S_A(B)的一个上界:假设Q~(-1)AQ=diag(λ_1,λ_2,…,λ_n),则 相似文献
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Two issues concerning the construction of square matrices with prescribe singular values an eigenvalues are addressed. First, a necessary and sufficient condition for the existence of an n × n complex matrix with n given nonnegative numbers as singular values an m ( n) given complex numbers to be m of the eigenvalues is determined. This extends the classical result of Weyl and Horn treating the case when m = n. Second, an algorithm is given to generate a triangular matrix with prescribe singular values an eigenvalues. Unlike earlier algorithms, the eigenvalues can be arranged in any prescribe order on the diagonal. A slight modification of this algorithm allows one to construct a real matrix with specified real an complex conjugate eigenvalues an specified singular values. The construction is done by multiplication by diagonal unitary matrices, permutation matrices and rotation matrices. It is numerically stable and may be useful in developing test software for numerical linear algebra packages. 相似文献
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讨论了矩阵奇异值的问题,利用奇异值分解定理给出了奇异值的极值性质,并用其证明了矩阵论中关于奇异值的一些经典结论. 相似文献
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Jiong-sheng Li Kai Yang Qing-xue WangDepartment of Mathematics University of Science Technology of China Hefei China 《应用数学学报(英文版)》2002,18(3):471-476
A complex matrix A is said to be a matrix realization of the digraph D if D is the associated digraph of A, and A is said to have the property B if every singular value of A is contained in the union of Brualdi-type intervals. A digraph D is said to be a forcible B-digraph if every matrix realization of D has the property B. In this paper, we give a sufficient condition for a matrix to have the property B and characterize the forcible B-digraphs. 相似文献
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Let G be a graph with n vertices, m edges and a vertex degree sequence (d
1, d
2,..., d
n
), where d
1 ≥ d
2 ≥ ... ≥ d
n
. The spectral radius and the largest Laplacian eigenvalue are denoted by ϱ(G) and μ(G), respectively. We determine the graphs with
and the graphs with d
n
≥ 1 and
We also present some sharp lower bounds for the Laplacian eigenvalues of a connected graph.
The work was supported by National Nature Science Foundation of China (10201009), Guangdong Provincial Natural Science Foundation
of China (021072) and Com2MaC-KOSEF 相似文献
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Toourknowledge,someextention,improvementandrevisionhavebeendonetomanyresultsonthesingularvaluesandthetracesofmatrices[1-8].Inthispaper,takingadvantageoftheinequalitiesobtainedintheclassicalrealfield,westudydeeplytheinequalityproblemsrelatingtothetrac… 相似文献
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朱雪芳 《数学的实践与认识》2012,42(2):209-213
设Z_n为非对角元素都为非正实数的n阶方阵的集合,令A_k∈Z_n,k∈{1,…,m},给出矩阵Fan积最小特征值的一个新下界,其中p_k>0且and (sum from k=1 to m)1/p_k≥1,这个下界改进了文献中的相关结果. 相似文献