Existence of seven solutions for an asymptotically linear Dirichlet problem without symmetries

Abstract

In this paper, we establish sufficient conditions for an asymptotically linear elliptic boundary value problem to have at least seven solutions. We use the mountain pass theorem, Lyapunov-Schmidt reduction arguments, existence of solutions that change sign exactly once, and bifurcation properties. No symmetry is assumed on the domain or the non-linearity. © 2011 Fondazione Annali di Matematica Pura ed Applicata and Springer-Verlag.