Fixed Points for Multivalued Convex Contractions on Nadler Sense Types in a Geodesic Metric Space

• Published in: Symmetry (Basel) Vol. 11; no. 2; p. 155
• Main Author: Bucur, Amelia
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-02-2019
• Subjects: 47H10; 54H25; Control theory; convex multivalued left A-contraction; fixed point; Fixed points (mathematics); geodesic metric space; Integral equations; Metric space; MSC; Ordinary differential equations; regular golbal-inf function; right A-contraction; Theorems
• ISSN: 2073-8994; 2073-8994
• DOI: 10.3390/sym11020155

In 1969, based on the concept of the Hausdorff metric, Nadler Jr. introduced the notion of multivalued contractions. He demonstrated that, in a complete metric space, a multivalued contraction possesses a fixed point. Later on, Nadler’s fixed point theorem was generalized by many authors in different ways. Using a method given by Angrisani, Clavelli in 1996 and Mureşan in 2002, we prove in this paper that, for a class of convex multivalued left A-contractions in the sense of Nadler and the right A-contractions with a convex metric, the fixed points set is non-empty and compact. In this paper we present the fixed point theorems for convex multivalued left A-contractions in the sense of Nadler and right A-contractions on the geodesic metric space. Our results are particular cases of some general theorems, to the multivalued left A-contractions in the sense of Nadler and right A-contractions, and particular cases of the results given by Rus (1979, 2008), Nadler (1969), Mureşan (2002, 2004), Bucur, Guran and Petruşel (2009), Petre and Bota (2013), etc., and are applicable in many fields, such as economy, management, society, biology, ecology, etc.