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Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.78.

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Spectral decomposition of real symmetric quadratic $\lambda$-matrices and its applications
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by Moody T. Chu and Shu-Fang Xu PDF
Math. Comp. 78 (2009), 293-313 Request permission

Abstract:

Spectral decomposition provides a canonical representation of an operator over a vector space in terms of its eigenvalues and eigenfunctions. The canonical form often facilitates discussions which, otherwise, would be complicated and involved. Spectral decomposition is of fundamental importance in many applications. The well-known GLR theory generalizes the classical result of eigendecomposition to matrix polynomials of higher degrees, but its development is based on complex numbers. This paper modifies the GLR theory for the special application to real symmetric quadratic matrix polynomials, $\mathcal {Q}(\lambda )=M \lambda ^{2} + C \lambda + K$, $M$ nonsingular, subject to the specific restriction that all matrices in the representation be real-valued. It is shown that the existence of the real spectral decomposition can be characterized through the notion of real standard pair which, in turn, can be constructed from the spectral data. Applications to a variety of challenging inverse problems are discussed.
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Additional Information
  • Moody T. Chu
  • Affiliation: Department of Mathematics, North Carolina State University, Raleigh, North Carolina 27695-8205
  • Email: chu@math.ncsu.edu
  • Shu-Fang Xu
  • Affiliation: LMAM, School of Mathematical Sciences, Peking University, Beijing, 100871, China
  • Email: xsf@pku.edu.cn
  • Received by editor(s): March 28, 2007
  • Received by editor(s) in revised form: December 12, 2007
  • Published electronically: June 24, 2008
  • Additional Notes: Research of the first author was supported in part by the National Science Foundation under grants DMS-0505880 and CCF-0732299.
    Research of the second author was supported in part by NSFC under grant 10571007.
  • © Copyright 2008 American Mathematical Society
    The copyright for this article reverts to public domain 28 years after publication.
  • Journal: Math. Comp. 78 (2009), 293-313
  • MSC (2000): Primary 65F15, 15A22, 65F18, 93B55
  • DOI: https://doi.org/10.1090/S0025-5718-08-02128-5
  • MathSciNet review: 2448708