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On quasi-definite quadratic forms in a Hilbert space and applications (CROSBI ID 561537)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Grubišić, Luka ; Kostrykin, Vadim ; Makarov, Konstantin A. ; Veselić, Krešimir On quasi-definite quadratic forms in a Hilbert space and applications // 80th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM). 2009

Podaci o odgovornosti

Grubišić, Luka ; Kostrykin, Vadim ; Makarov, Konstantin A. ; Veselić, Krešimir

engleski

On quasi-definite quadratic forms in a Hilbert space and applications

We present a perturbation theory for sign-indefinite, not necessarily semi-bounded, quadratic forms in a Hilbert space. As a first step, and under an additional qualitative assumption on the algebraic structure of the form, we prove an operator representation theorem. This structural restriction is in analogy to the structure of the so called quasi-definite matrices from Linear Algebra. As prototype applications for our perturbation results we consider consequences for the theory of systems of partial differential equations. More to the point, we obtain several subspace perturbation theorems for these “quasi-definite operators”. The results are obtained using weakly formulated Riccati and Sylvester operator equations. Accompanying estimates on the perturbation of the spectra are also presented. Various estimation approaches are compared on the explicit example of the Stokes block matrix operator. This operator is associated to the Cosserat eigenvalue problem. We also show that on this example some of our estimates can be attained. The present work continues previous studies of weakly formulated operator equations from L. Grubišić and K. Veselić. On weakly formulated Sylvester equation and applications. Integral Equations and Operator Theory, 58(2), 2007. This is a joint work with Vadim Kostrykin, Konstantin Makarov and Krešimir Veselić.

indefinite quadratic forms; representation theorems

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Podaci o prilogu

2009.

objavljeno

Podaci o matičnoj publikaciji

80th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM)

Podaci o skupu

80th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM)

predavanje

09.02.2009-13.02.2009

Gdańsk, Poljska

Povezanost rada

Matematika

Poveznice