Abstract
We consider a nonlinear Dirichlet problem driven by the p-Laplacian and a reaction which exhibits the combined effects of concave (that is, sublinear) terms and of convex (that is, superlinear) terms. The concave term is indefinite and the convex term need not satisfy the usual in such cases Ambrosetti-Rabinowitz condition. We prove a bifurcation-type result describing the set of positive solutions as the positive parameter λ varies.
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