Abstract
In this paper, we present now existence results of nontrivial positive solutions for phi-Laplacian Dirichlet boundary value problems on bounded intervals of the real line. The nonlinear terms encompasses the sub-linear and super-linear cases. The Krasnosel'skii's fixed point theorem on cone expansion and compression is used. Applications to p-Laplacian problems and to the case of the sum of p-Laplacian and q-Laplacian (p not equal q) operators axe given.