EN
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.