A Fixed Point Theorem for Random Asymptotically Pointwise Contractions

Abstract

This paper combines the decomposition technique ($\sigma$-stability) in random functional analysis with the deterministic theory of asymptotically pointwise contractions to provide a complete self-contained derivation of a fixed point theorem for random asymptotically pointwise contractions. We assume the contraction function is linear $\psi(t)=\lambda t$ ($\lambda<1$) and focus on the linear case under the assumption that $G$ is bounded. By choosing $p$ sufficiently large so that $5^{1/p}\lambda<1$, we apply the deterministic theorem in $L^p(E)$. The paper gives detailed explanations of concepts such as random normed modules, the $(\epsilon,\lambda)$-topology, and $\sigma$-stability, and reviews the historical development of fixed point theory in the introduction.