Approximating common fixed points of a three-step iteration for four asymptotically non-expansive mappings in CAT(0) spaces

Abstract

In the present paper, we study a three-step iterative algorithm for four asymptotically non-expansive mappings in CAT(0) spaces.The result presented in this paper improve and extend the corresponding results of [Y.Niwongsa and B.Panyank: Noor Iteration for Asymptotically Nonexpansive Mappings in $CAT(0)$ Spaces [9]].Consquently an interesting example is provided to illustrate the main results.