Département de Mathématique, Université Catholique de Louvain, Chemin du Cyclotron 2, Louvain-la-Neuve B-1348, Belgium
Copyright © 1994 C. De Coster et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This paper is devoted to the study of the problemWe assume that can be written under the formwhere is a bounded function. We obtain existence conditions related to uniqueness conditions for the solution of the linear problem