Existence and data dependence of fixed points for multivalued operators on gauge spaces

The purpose of this note is to present some fixed point and data dependence theorems in complete gauge spaces and in hyperconvex metric spaces for the so-called Meir-Keeler multivalued operators and admissible multivalued a(alpha)-contractions. Our results extend and generalize several theorems of Espinola and Kirk [R. Espinola, W.A. Kirk, Set-valued contractions and fixed points, Nonlinear Anal. 54 (2003) 485-494] and Rus, Petrusel, and Sintamarian [I.A. Rus, A. Petrusel, A. Sintamarian, Data dependence of the fixed point set of some multivalued weakly Picard operators, Nonlinear Anal. 52 (2003)1947-1959]. (C) 2004 Elsevier Inc. All rights reserved.