SOME FIXED POINT THEOREMS FOR GENERALIZED $lpha$-GERAGHTY CONTRACTION TYPE MAPPINGS IN $B$-METRIC~SPACES AND SOME APPLICATIONS TO THE NONLINEAR INTEGRAL EQUATION

摘要

The purpose of this paper is to introduce the notion of a generalized $lpha$-Geraghty contraction type mapping in $b$-metric~spaces and state the existence and uniqueness of a fixed point for this mapping. These results are generalizations of certain the main results in [D.~DJ uki'{c}, Z.~Kadelburg, and S.~Radenovi'{c}, emph{Fixed points of Geraghty-type mappings in various generalized metric spaces}, Abstr. Appl. Anal. extbf{2011} (2011), 13 pages] and [O.~Popescu, emph{ Some new fixed point theorems for $lpha$-Geraghty contraction type maps in metric spaces}, Fixed Point Theory Appl. extbf{2014:190} (2014), 1 -- 12]. Some examples are given to illustrate the obtained results and to show that these results are proper extensions of the existing ones. Then we apply the obtained theorem to study the existence of solutions to the nonlinear integral equation.