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Continuum spectrum for the linearized extremal eigenvalue problem with boundary reactions

Futoshi Takahashi — 2014

Mathematica Bohemica

We study the semilinear problem with the boundary reaction - Δ u + u = 0 in Ω , u ν = λ f ( u ) on Ω , where Ω N , N 2 , is a smooth bounded domain, f : [ 0 , ) ( 0 , ) is a smooth, strictly positive, convex, increasing function which is superlinear at , and λ > 0 is a parameter. It is known that there exists an extremal parameter λ * > 0 such that a classical minimal solution exists for λ < λ * , and there is no solution for λ > λ * . Moreover, there is a unique weak solution u * corresponding to the parameter λ = λ * . In this paper, we continue to study the spectral properties of u * and show...

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