Multiple solutions with changing sign energy to a nonlinear elliptic equation
A. El Hamidi - Laboratoire de Mathematiques et Applications, Universit´e de La Rochelle, 17042 La Rochelle, France (email)
Abstract: In this paper, the existence of multiple solutions to a nonlinear elliptic equation with a parameter $\lambda$ is studied. Initially, the existence of two nonnegative solutions is showed for $0 < \lambda < \hat \lambda$. The first solution has a negative energy while the energy of the second one is positive for $0 < \lambda < \lambda_0$ and negative for $\lambda_0 < \lambda < \hat \lambda$. The values $\lambda_0$ and $\hat \lambda$ are given under variational form and we show that every corresponding critical point is solution of the nonlinear elliptic problem (with a suitable multiplicative term). Finally, the existence of two classes of infinitely many solutions is showed via the Lusternik-Schnirelman theory.
Keywords: Ekeland’s principle, p-Laplacian operator, Palais-Smale condition,
Received: July 2003; Revised: December 2003; Published: March 2004.
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