Nonlinear biharmonic boundary value problem
1 Department of Mathematics, Kunsan National University, Kunsan, 573-701, Korea
2 Department of Mathematics Education, Inha University, Incheon, 402-751, Korea
Boundary Value Problems 2014, 2014:30 doi:10.1186/1687-2770-2014-30Published: 4 February 2014
We consider the nonlinear biharmonic equation with variable coefficient and polynomial growth nonlinearity and Dirichlet boundary condition. We get two theorems. One theorem says that there exists at least one bounded solution under some condition. The other one says that there exist at least two solutions, one of which is a bounded solution and the other of which has a large norm under some condition. We obtain this result by the variational method, generalized mountain pass geometry and the critical point theory of the associated functional.
MSC: 35J20, 35J25, 35Q72.