Quasilinear Problems with the Competition Between Convex and Concave Nonlinearities and Variable Potentials

The purpose of this paper is to prove some existence and non-existence theorems for the nonlinear elliptic problems of the form -Δ_{p}u=λk(x)u^{q}\pmh(x)u^{σ} if x\inΩ, subject to the Dirichlet conditions u_{1}=u_{2}=0 on \partialΩ. In the proofs of our results we use the sub-super solutions method and variational arguments. Related results as obtained here have been established in [Z. Guo and Z. Zhang, W^{1,p} versus C^{1} local minimizers and multiplicity results for quasilinear elliptic equations, Journal of Mathematical Analysis and Applications, Volume 286, Issue 1, Pages 32-50, 1 October 2003.] for the case k(x)=h(x)=1. Our results reveal some interesting behavior of the solutions due to the interaction between convex-concave nonlinearities and variable potentials.

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