2021 UNC Greensboro PDE Conference. Electron. J. Diff. Eqns., Conference 26 (2022), pp. 33-43.

Basisness of Fucik eigenfunctions for the Dirichlet Laplacian

Falko Baustian, Vladimir Bobkov

We provide improved sufficient assumptions on sequences of Fucik eigenvalues of the one-dimensional Dirichlet Laplacian which guarantee that the corresponding Fucik eigenfunctions form a Riesz basis in L2(0,π). For that purpose, we introduce a criterion for a sequence in a Hilbert space to be a Riesz basis.

Published August 25, 2022.
Math Subject Classifications: 34L10, 34B08, 47A70.
Key Words: Fucik spectrum; Fucik eigenfunctions; Riesz basis; Paley-Wiener stability.

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Falko Baustian
Institute of Mathematics
University of Rostock, Germany
email: falko.baustian@uni-rostock.de
Vladimir Bobkov
Institute of Mathematics
Ufa Federal Research Centre, Russia
email: bobkov@matem.anrb.ru

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