Abstract
We consider the Robin Laplacian in two bounded regions Ω1 and Ω2 of ℝN with Lipschitz boundaries and such that Ω2 ⊂ Ω1, and we obtain two-sided estimates for the eigenvalues λ n,2 of the Robin Laplacian in Ω2 via the eigenvalues λ n, 1 of the Robin Laplacian in Ω1. Our estimates depend on the measure of the set difference Ω\Ω2 and on suitably defined characteristics of vicinity of the boundaries ∂Ω1 and ∂Ω2, and of the functions defined on ∂Ω1 and on ∂Ω2 that enter the Robin boundary conditions.
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Burenkov, V.I., Lanza de Cristoforis, M. Spectral stability of the Robin Laplacian. Proc. Steklov Inst. Math. 260, 68–89 (2008). https://doi.org/10.1134/S0081543808010069
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DOI: https://doi.org/10.1134/S0081543808010069