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- W1973966910 abstract "We prove that if A=[Aij]∈RN,N is a block symmetric matrix and y is a solution of a nearby linear system (A+E)y=b, then there exists F=FT such that y solves a nearby symmetric system (A+F)y=b, if A is symmetric positive definite or the matricial norm μ(A)=(‖Aij‖2) is diagonally dominant. Our blockwise analysis extends existing normwise and componentwise results on preserving symmetric perturbations (cf. [J.R. Bunch, J.W. Demmel, Ch. F. Van Loan, The strong stability of algorithms for solving symmetric linear systems, SIAM J.Matrix Anal. Appl. 10 (4) (1989) 494–499; D. Herceg, N. Krejić, On the strong componentwise stability and H-matrices, Demonstratio Mathematica 30 (2) (1997) 373–378; A. Smoktunowicz, A note on the strong componentwise stability of algorithms for solving symmetric linear systems, Demonstratio Mathematica 28 (2) (1995) 443–448])." @default.
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- W1973966910 date "2008-11-01" @default.
- W1973966910 modified "2023-09-28" @default.
- W1973966910 title "Block matrices and symmetric perturbations" @default.
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- W1973966910 doi "https://doi.org/10.1016/j.laa.2008.03.013" @default.
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