Positive Solutions for Elliptic Boundary Value Problems with a

CUBO A Mathematical Journal
Vol.10, N¯o 04, (109–117). December 2008
Positive Solutions for Elliptic Boundary Value
Problems with a Harnack-Like Property
Toufik Moussaoui
Department of Mathematics, E.N.S.,
P.O. Box 92, 16050 Kouba, Algiers, Algeria
email: [email protected]
and
Radu Precup
Department of Applied Mathematics,
Babeş–Bolyai University, 400084 Cluj, Romania
email: [email protected]
ABSTRACT
The aim of this paper is to present some existence results of positive solutions for
elliptic equations and systems on bounded domains of RN (N ≥ 1). The main tool is
Krasnosel’skii’s compression-expansion fixed point theorem.
RESUMEN
El objetivo de este artı́culo es presentar algunos resultados de existencia de soluciones
positivas para ecuaciones elipticas y sistemas sobre dominios acotados de RN (N ≥ 1).
La principal herramienta es el teorema de punto fijo compresión-expansión de Krasnosel’skii.