We show that the spectrum of $Δ²_{p} u + 2β·∇(|Δu|^{p-2}Δu) + |β|²|Δu|^{p-2}Δu = αm|u|^{p-2}u$, where $β ∈ ℝ^{N}$, under Navier boundary conditions, contains at least one sequence of eigensurfaces.
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The aim of this paper is to study the spectrum of the fourth order eigenvalue boundary value problem ⎧Δ²u = αu + βΔu in Ω, ⎨ ⎩u = Δu = 0 on ∂Ω. where (α,β) ∈ ℝ². We prove the existence of a first nontrivial curve of this spectrum and we give its variational characterization. Moreover we prove some properties of this curve, e.g., continuity, convexity, and asymptotic behavior. As an application, we study the non-resonance of solutions below the first principal eigencurve of the biharmonic problem ⎧Δ²u = f(u,x) + βΔu + h in Ω, ⎨ ⎩Δu = u = 0 ∂Ω, where f: Ω × ℝ → ℝ is a Carathéodory function and h is a given function in L²(Ω).
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The aim of this paper is to establish the existence of at least three solutions for the nonlinear Neumann boundary-value problem involving the p(x)-Laplacian of the form $-Δ_{p(x)}u + a(x)|u^{|p(x)-2}u = μg(x,u)$ in Ω, $|∇u|^{p(x)-2} ∂u/∂ν = λf(x,u)$ on ∂Ω. Our technical approach is based on the three critical points theorem due to Ricceri.
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