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Johannes Sjöstrand; Maciej Zworski
Elementary linear algebra for advanced spectral problems
(Algèbre linéaire élémentaire pour des problèmes d’analyse spectrale)
Annales de l'institut Fourier, 57 no. 7 (2007), p. 2095-2141, doi: 10.5802/aif.2328
Article PDF | Reviews MR 2394537 | Zbl 1140.15009 | 5 citations in Cedram
Class. Math.: 15A21, 35P05, 35Q40, 81Q15
Keywords: Grushin problem, Schur complement, Feshbach reduction, eigenvalues, resonances, trace formulæ

Résumé - Abstract

We describe a simple linear algebra idea which has been used in different branches of mathematics such as bifurcation theory, partial differential equations and numerical analysis. Under the name of the Schur complement method it is one of the standard tools of applied linear algebra. In PDE and spectral analysis it is sometimes called the Grushin problem method, and here we concentrate on its uses in the study of infinite dimensional problems, coming from partial differential operators of mathematical physics.

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