Wardowski (2012) introduced a new type of contractive mapping and proved a fixed point result in complete metric spaces as a generalization of Banach contraction principle. In this paper, we introduce a notion of generalized F-contraction mappings which is used to prove a fixed point result for generalized nonexpansive mappings on star-shaped subsets of normed linear spaces. Some theorems on invariant approximations in normed linear spaces are also deduced. Our results extend, unify, and generalize comparable results in the literature.
"Generalized Contraction and Invariant Approximation Results on Nonconvex Subsets of Normed Spaces." Abstr. Appl. Anal. 2014 (SI05) 1 - 5, 2014. https://doi.org/10.1155/2014/391952