A comparison result for perturbed radial p-Laplacians

Consider the radially symmetric p-Laplacian for p 2 under zero Dirichlet boundary conditions. The main result of the present paper is that under appropriate conditions a solution of a perturbed (radially symmetric) p-Laplacian can be compared with the solution of the unperturbed one. As a consequence one obtains a sign preserving result for a system of p-Laplacians which are coupled in a nonquasimonotone way.  2003 Elsevier Inc. All rights reserved.