Extremal solutions for the difference phi-Laplacian problem with nonlinear functional boundary conditions
In this paper, we study the existence and approximation of the extremal solutions for the phi -Laplacian problem lying between a pair of a lower solution alpha and an upper solution beta such that alpha less than or equal to beta. We consider general boundary functional conditions that include classical ones as separated or periodic. (C) 2001 Elsevier Science Ltd. All rights reserved.
phi-laplacian problem difference equations nonlinear boundary value problem