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On a nonhomogeneous quasilinear eigenvalue problem in Sobolev spaces with variable exponent
Authors:Mihai Mihailescu   Vicentiu Radulescu
Affiliation:Department of Mathematics, University of Craiova, 200585 Craiova, Romania ; Department of Mathematics, University of Craiova, 200585 Craiova, Romania
Abstract:
We consider the nonlinear eigenvalue problem

$displaystyle -{rm div}left(vertnabla uvert^{p(x)-2}nabla uright)=lambda vert uvert^{q(x)-2}u$

in $ Omega$, $ u=0$ on $ partialOmega$, where $ Omega$ is a bounded open set in $ mathbb{R}^N$ with smooth boundary and $ p$, $ q$ are continuous functions on $ overlineOmega$ such that $ 1<inf_Omega q< inf_Omega p<sup_Omega q$, $ sup_Omega p<N$, and $ q(x)<Np(x)/left(N-p(x)right)$ for all $ xinoverlineOmega$. The main result of this paper establishes that any $ lambda>0$ sufficiently small is an eigenvalue of the above nonhomogeneous quasilinear problem. The proof relies on simple variational arguments based on Ekeland's variational principle.

Keywords:
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