Abstract
If A is an H-selfadjoint matrix, a “general perturbation” of the pair (A, H) results in a pair (B, G), in which B is G-selfadjoint and is close to the unperturbed pair (A, H) in an appropriate sense. A similar convention applies to the perturbations of H-unitary matrices considered here.
Identification of a quantity which is invariant under such perturbations is one of the main results of the chapter. This general theorem will admit the characterization of all diagonalizable H-selfadjoint matrices with real spectrum which retain these properties after a general perturbation. Also a description of those cases in which analytic perturbations of H-selfadjoint matrices retain spectral properties which are familiar from the classical hermitian case is obtained. Analogous results for perturbations of H-unitary matrices are also discussed.
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© 2005 Birkhäuser Verlag
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(2005). General Perturbations. Stability of Diagonalizable Matrices. In: Indefinite Linear Algebra and Applications. Birkhäuser Basel. https://doi.org/10.1007/3-7643-7350-4_9
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DOI: https://doi.org/10.1007/3-7643-7350-4_9
Publisher Name: Birkhäuser Basel
Print ISBN: 978-3-7643-7349-8
Online ISBN: 978-3-7643-7350-4
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