An application of Ramsey’s Theorem to the Banach Contraction Principle

Author:

Merryfield James,Rothschild Bruce,Stein James

Abstract

One of the most fundamental fixed-point theorems is Banach’s Contraction Principle, of which the following conjecture is a generalization. Generalized Banach Contraction Conjecture (GBCC). Let T T be a self-map of a complete metric space ( X , d ) (X,d) , and let 0 > M > 1 0>M>1 . Let J J be a positive integer. Assume that for each pair x , y X x,y\in X , min { d ( T k x , T k y ) : 1 k J } M d ( x , y ) \min \{d(T^kx, T^ky):1\le k\le J\}\le M\,d(x,y) . Then T T has a fixed point. Unlike Banach’s original theorem (the case J = 1 J=1 ), the above hypothesis does not compel T T to be continuous. In this paper we use Ramsey’s Theorem from combinatorics to establish the GBCC for arbitrary J J in the case when T T is assumed to be continuous, and also derive a result which enables us to prove the GBCC when J = 3 J=3 without the assumption of continuity; it is known that the case J = 3 J=3 includes instances where T T is not continuous.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference3 articles.

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