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Infinitely many low- and high-energy solutions for a class of elliptic equations with variable exponent
Chang-Mu Chu,Haidong Liu
Keywords:p(x)-Laplacian, variable exponent, infinitely many solutions, Clark"s theorem, symmetric mountain pass lemma.
      This paper is concerned with the $p(x)$-Laplacian equation of the form \begin{equation}\label{eq0.1} \left\{\begin{array}{ll} -\Delta_{p(x)} u=Q(x)|u|^{r(x)-2}u, &\mbox{in}\ \Omega,\u=0, &\mbox{on}\ \partial \Omega, \end{array}\right. \end{equation} where $\Omega\subset\R^N$ is a smooth bounded domain, $1p^+$ and $Q: \overline{\Omega}\to\R$ is a nonnegative continuous function. We prove that \eqref{eq0.1} has infinitely many small solutions and infinitely many large solutions by using the Clark"s theorem and the symmetric mountain pass lemma.