On some fixed point theorems under (α,ψ,ϕ) -contractivity conditions in metric spaces endowed with transitive binary relations
Shahzad, Naseer
Karapinar, Erdal
Roldán López de Hierro, Antonio Francisco
Metric spaces
Fixed point theorems
After the appearance of Nieto and Rodríguez-López’s theorem, the branch of fixed point theory devoted to the setting of partially ordered metric spaces have attracted much attention in the last years, especially when coupled, tripled, quadrupled and, in general, multidimensional fixed points are studied. Almost all papers in this direction have been forced to present two results assuming two different hypotheses: the involved mapping should be continuous or the metric framework should be regular. Both conditions seem to be different in nature because one of them refers to the mapping and the other one is assumed on the ambient space. In this paper, we unify such different conditions in a unique one. By introducing the notion of continuity of a mapping from a metric space into itself depending on a function α, which is the case that covers the partially ordered setting, we extend some very recent theorems involving control functions that only must be lower/upper semi-continuous from the right. Finally, we use metric spaces endowed with transitive binary relations rather than partial orders.
2015-09-03T07:40:13Z
2015-09-03T07:40:13Z
2015
info:eu-repo/semantics/article
Shahzad, N.; Karapinar, E.; Roldán López de Hierro, A.F. On some fixed point theorems under (α,ψ,ϕ) -contractivity conditions in metric spaces endowed with transitive binary relations. Fixed Point Theory and Applications, 2015: 124 (2015). [http://hdl.handle.net/10481/37229]
1687-1812
http://hdl.handle.net/10481/37229
10.1186/s13663-015-0359-5
eng
http://creativecommons.org/licenses/by-nc-nd/3.0/
info:eu-repo/semantics/openAccess
Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Springer Open