Existence of solutions to nonlinear, subcritical higher-order elliptic Dirichlet problems

Details Existence of solutions to nonlinear, subcritical higher-order elliptic Dirichlet problems Existence of solutions to nonlinear, subcritical higher-order elliptic Dirichlet problems

2009-06-12

arxiv.org/abs/0906.2345v1

Mathematics

Analysis of PDEs

Scientific paper

We consider the $2m$-th order elliptic boundary value problem $Lu=f(x,u)$ on a bounded smooth domain $\Omega\subset\R^N$ with Dirichlet boundary conditions on $\partial\Omega$. The operator $L$ is a uniformly elliptic linear operator of order $2m$ whose principle part is of the form $\big(-\sum_{i,j=1}^N a_{ij}(x) \frac{\partial^2}{\partial x_i\partial x_j}\big)^m$. We assume that $f$ is superlinear at the origin and satisfies $\lim \limits_{s\to\infty}\frac{f(x,s)}{s^q}=h(x)$, $\lim \limits_{s\to-\infty}\frac{f(x,s)}{|s|^q}=k(x)$, where $h,k\in C(\overline{\Omega})$ are positive functions and $q>1$ is subcritical. By combining degree theory with new and recently established a priori estimates, we prove the existence of a nontrivial solution.

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