Electron. J. Diff. Equ., Vol. 2014 (2014), No. 207, pp. 1-29.

Multiple solutions to asymmetric semilinear elliptic problems via Morse theory

Leandro Recova, Adolfo Rumbos

In this article we study the existence of solutions to the problem
  -\Delta u = g(x,u) \quad   \text{in } \Omega; \cr
   u = 0 \quad\text{on } \partial\Omega,
where $\Omega$ is a smooth bounded domain in $\mathbb{R}^N$ $(N\geq 2)$ and $g:\overline{\Omega}\times\mathbb{R}\to\mathbb{R}$ is a differentiable function with g(x,0)=0 for all $x\in\Omega$. By using minimax methods and Morse theory, we prove the existence of at least three nontrivial solutions for the case in which an asymmetric condition on the nonlinearity g is assumed. The first two nontrivial solutions are obtained by employing a cutoff technique used by Chang et al in [9]. For the existence of the third nontrivial solution, first we compute the critical group at infinity of the associated functional by using a technique used by Liu and Shaoping in [19]. The final result is obtained by using a standard argument involving the Morse relation.

Submitted February 28, 2014. Published October 7, 2014.
Math Subject Classifications: 35J20.
Key Words: Morse theory; critical groups, local linking.

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Leandro L. Recova
Institute of Mathematical Sciences
Claremont Graduate University
Claremont, California 91711, USA
email: leandro.recova@cgu.edu
Adolfo J. Rumbos
Department of Mathematics, Pomona College
Claremont, California 91711, USA
email: arumbos@pomona.edu

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