Two positive solutions for a class of nonhomogeneous elliptic equations

Abstract

In this paper we develop an original variational approach which allows us to prove the existence of two positive solutions for a class of semilinear nonhomogeneous elliptic equations set on $\mathbb{R}^{N}$. In addition to a lack of compactness the main difficulty to overcome is the degenerated structure of the set of possible critical points.