COMPATIBLE MAPPINGS AND COMMON FIXED POINTS

COMPATIBLE MAPPINGS AND COMMON FIXED POINTS

1986 | GERALD JUNGCK
This paper introduces a generalized concept of commuting mappings called "compatible mappings" and explores their properties. It generalizes several theorems, including those by Park and Bae, Hadzic, and others, by replacing the commutativity condition with compatibility. Compatible mappings are defined as self-mappings of a metric space where the limit of the distance between the compositions of the mappings approaches zero along a sequence converging to a common limit. The paper provides examples illustrating the weakening of the commutativity requirement and discusses the utility of compatible mappings in fixed point theory. It also extends a theorem by Park and Bae to four functions using the concept of $(\varepsilon,\delta)$-contractibility. The paper proves several results showing that compatible mappings can be used to establish common fixed points under certain conditions. It also discusses the role of compatibility in producing common fixed points and provides a corollary generalizing Fisher's theorem. The paper concludes with a question about the necessity of lower semi-continuity of $\delta$ in Theorem 3.2.This paper introduces a generalized concept of commuting mappings called "compatible mappings" and explores their properties. It generalizes several theorems, including those by Park and Bae, Hadzic, and others, by replacing the commutativity condition with compatibility. Compatible mappings are defined as self-mappings of a metric space where the limit of the distance between the compositions of the mappings approaches zero along a sequence converging to a common limit. The paper provides examples illustrating the weakening of the commutativity requirement and discusses the utility of compatible mappings in fixed point theory. It also extends a theorem by Park and Bae to four functions using the concept of $(\varepsilon,\delta)$-contractibility. The paper proves several results showing that compatible mappings can be used to establish common fixed points under certain conditions. It also discusses the role of compatibility in producing common fixed points and provides a corollary generalizing Fisher's theorem. The paper concludes with a question about the necessity of lower semi-continuity of $\delta$ in Theorem 3.2.
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