Multiple positive solutions for quasilinear elliptic problems with sign-changing nonlinearities.
Two nontrivial solutions are obtained for nonhomogeneous semilinear Schrödinger equations.
In this paper we are concerned with questions of multiplicity and concentration behavior of positive solutions of the elliptic problem( P ε ) ℒ ε u = f ( u ) in IR 3 , u > 0 in IR 3 , u ∈ H 1 ( IR 3 ) , whereε is a small positive parameter, f : ℝ → ℝ is a continuous function,ℒ ε is a nonlocal operator defined byℒ ε u = M 1 ε ∫ IR 3 | ∇ u | 2 + 1 ε 3 ∫ IR 3 V ( x ) u 2 [ − ε 2 Δ u + V ( x ) u ] ,M : IR+ → IR+ and V : IR3 → IR are continuous functions which verify some hypotheses.