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.
Nous décrivons une idée simple d’algèbre linéaire, qui a été utilisée dans différentes branches des mathématiques, telles que la théorie des bifurcations, les équations aux dérivées partielles et l’analyse numérique. Sous le nom de la méthode des compléments de Schur c’est un des outils standard de l’algèbre linéaire appliquée. En e.d.p. et en analyse spectrale elle est parfois appelée la méthode des problèmes de Grushin, et ici nous nous concentrons sur son utilisation dans l’étude des problèmes en dimension infinie, venant des équations aux dérivées partielles de la physique mathématique.
Keywords: Grushin problem, Schur complement, Feshbach reduction, eigenvalues, resonances, trace formulæ
Mot clés : problème de Grushin, complément de Schur, réduction de Feschbach, valeurs propres, résonances, formules de trace
Sjöstrand, Johannes 1; Zworski, Maciej 2
@article{AIF_2007__57_7_2095_0, author = {Sj\"ostrand, Johannes and Zworski, Maciej}, title = {Elementary linear algebra for advanced spectral problems}, journal = {Annales de l'Institut Fourier}, pages = {2095--2141}, publisher = {Association des Annales de l{\textquoteright}institut Fourier}, volume = {57}, number = {7}, year = {2007}, doi = {10.5802/aif.2328}, mrnumber = {2394537}, zbl = {1140.15009}, language = {en}, url = {https://aif.centre-mersenne.org/articles/10.5802/aif.2328/} }
TY - JOUR AU - Sjöstrand, Johannes AU - Zworski, Maciej TI - Elementary linear algebra for advanced spectral problems JO - Annales de l'Institut Fourier PY - 2007 SP - 2095 EP - 2141 VL - 57 IS - 7 PB - Association des Annales de l’institut Fourier UR - https://aif.centre-mersenne.org/articles/10.5802/aif.2328/ DO - 10.5802/aif.2328 LA - en ID - AIF_2007__57_7_2095_0 ER -
%0 Journal Article %A Sjöstrand, Johannes %A Zworski, Maciej %T Elementary linear algebra for advanced spectral problems %J Annales de l'Institut Fourier %D 2007 %P 2095-2141 %V 57 %N 7 %I Association des Annales de l’institut Fourier %U https://aif.centre-mersenne.org/articles/10.5802/aif.2328/ %R 10.5802/aif.2328 %G en %F AIF_2007__57_7_2095_0
Sjöstrand, Johannes; Zworski, Maciej. Elementary linear algebra for advanced spectral problems. Annales de l'Institut Fourier, Volume 57 (2007) no. 7, pp. 2095-2141. doi : 10.5802/aif.2328. https://aif.centre-mersenne.org/articles/10.5802/aif.2328/
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