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【期刊论文】Notes on Completely Positive Matrices
向淑晃, Shuhuang Xiang, Shuwen Xiang
COMPLETELY POSITIVE MATRICES, 1-10,-0001,():
-1年11月30日
Let A be a n
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【期刊论文】Weak block diagonally dominant matrices, weak block H-matrix and their applications 1
向淑晃, Shu-huang Xiana, b, Zhao-yong Youb
Linear Algebra and its Applications 282(1998)263-274,-0001,():
-1年11月30日
Here we introduce more general definitions of weak block diagonally dominant ma-trix and weak block H-matrix which permit block triangular factorizations and extend the theory to the block diagonally dominant matrices and the block H-matrices. Fur-thermore,by the theory of weak block H-matrix, we prove that any partitioned block form of a pointwise H-matrix has a block triangular factorization. 1998 Elsevier Science Inc. All rights reserved.
Block diagonally dominant matrix, Block H-matrix, Weak block diagonally dcminant matrix, Weak block H-matrix, Generalized ultrametric matrix
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【期刊论文】Some Inverse M-matrix Problems
向淑晃, Shuhuang Xiang, Zhaoyong You
,-0001,():
-1年11月30日
An upper bound and a lower bound for ®0 are given suchthat ®I+B2M1for®>®0and®I+B62M1for®•®0, where B is a nonnegative matrix and satises that for any positive constant, I+B is a power invariant zero pattern matrix.
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【期刊论文】Mappings of Conservative Distances and the Mazur TUlam Theorem
向淑晃, Shuhuang Xiang
Journal of Mathematical Analysis and Applications 254, 262-274 (2001).,-0001,():
-1年11月30日
Let X and Y be two real Hilbert spaces with the dimension of X greater than 1. Several cases about the Aleksandrov Rassias problem for T: XY preserving two or three distances are presented and geometric interpretations of these cases are also given.
Euclidean space, isometry, parallelogram, Hilbert space.,
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【期刊论文】ON THE ALEKSANDROV-RASSIAS PROBLEM FOR ISOMETRIC
向淑晃, MAPPINGS SHUHUANG XIANG
,-0001,():
-1年11月30日
Let X and Y be normed real vector spaces. A mapping T: X Y is called preserving the distance r if for all x; y of X with kx ykX = r then kT(x) T(y)k = r. In this paper, we provide an overall account of the developmentof the Aleksandrov problem, especially the Aleksandrov Rassias problem for mappings which preserves distances with a noninteger ratioin in Hilbert spaces.
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