Published online by Cambridge University Press: 08 February 2017
In this paper, we study the multiplicity of solutions for the following problem: $$\begin{equation*}\begin{cases}-\Delta u-\Delta(|u|^{\alpha})|u|^{\alpha-2}u=g(x,u)+\theta h(x,u), \ \ x\in \Omega,\\u=0, \ \ x\in \partial\Omega,\end{cases}\end{equation*}$$
${\mathbb{R}}$ N , θ is a parameter and g, h ∈ C(
$\bar{\Omega}$ ×
${\mathbb{R}}$ ). Under the assumptions that g(x, u) is odd and locally superlinear at infinity in u, we prove that for any j ∈
$\mathbb{N}$ there exists ϵj > 0 such that if |θ| ≤ ϵj , the above problem possesses at least j distinct solutions. Our results generalize some known results in the literature and are new even in the symmetric situation.