Abstract

Let H be a real Hilbert space, K a nonempty subset of H, and $T:K\rightarrow \mathit{CB}(K)$ a multi-valued mapping. Then T is called a generalized k-strictly pseudo-contractive multi-valued mapping if there exists $k\in[0,1)$ such that, for all $x,y\in D(T)$ , we have $D^{2}(Tx,Ty)\leq\|x-y\|^{2}+kD^{2}(Ax,Ay)$ , where $A:=I-T$ , and I is the identity operator on K. A Krasnoselskii-type algorithm is constructed and proved to be an approximate fixed point sequence for a common fixed point of a finite family of this class of maps. Furthermore, assuming existence, strong convergence to a common fixed point of the family is proved under appropriate additional assumptions.

Highlights

  • Let H be a real Hilbert space, CB(H) denote the collection of nonempty, closed, and bounded subsets of H

  • The fixed point set of T is denoted by F(T) := {x ∈ D(T) : x ∈ Tx}

  • The study of fixed points for multi-valued nonexpansive mappings using Hausdorff metric was introduced by Markin [ ], and studied extensively by Nadler [ ]

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Summary

Introduction

Let H be a real Hilbert space, CB(H) denote the collection of nonempty, closed, and bounded subsets of H. The class of multi-valued pseudo-contractive mappings introduced by Chidume et al [ ] is as follows. M} of multi-valued ki-strictly pseudo-contractive mappings using a Krasnoselskii-type algorithm Chidume and Okpala [ ] introduced the following definition for multi-valued k-strictly pseudo-contractive mappings. M} of generalized ki-strictly pseudo-contractive multi-valued mappings in a real Hilbert space. ([ ]) Let K be a nonempty subset of a real Hilbert space H and T : K → CB(K) be a generalized k-strictly pseudo-contractive multi-valued mapping. M} of generalized ki-strictly pseudocontractive multi-valued mappings and arbitrary sequence {xn} ⊆ K , let. M, let Ti : K → CB(K) be a family of generalized ki-strictly pseudo-contractive multi-valued mappings with ki ∈ ( , ).

Lemma together with
We have
Tip if and only if p

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