EN
We present two results on existence of infinitely many positive solutions to the Neumann problem
⎧ $-Δ_{p}u + λ(x)|u|^{p-2}u = μf(x,u)$ in Ω,
⎨
⎩ ∂u/∂ν = 0 on ∂Ω,
where $Ω ⊂ ℝ^{N}$ is a bounded open set with sufficiently smooth boundary ∂Ω, ν is the outer unit normal vector to ∂Ω, p > 1, μ > 0, $λ ∈ L^{∞}(Ω)$ with $essinf_{x∈Ω} λ(x) > 0$ and f: Ω × ℝ → ℝ is a Carathéodory function. Our results ensure the existence of a sequence of nonzero and nonnegative weak solutions to the above problem.