Extensional maps and approximate inverse limits

Abstract

In 2012, Žiga Virk introduced the notion of an extensional equivalence, herein called an extensional map, and used it to generalize part of the extension theory factorization theorem of M. Levin, L. Rubin, and P. Schapiro. Here were are going to study this notion in the setting of inverse systems of compact Hausdorff spaces and approximate inverse systems of compact metric spaces. In both cases we will show that given a surjective map f to the limit, if each coordinate map pγ∘f is an extensional map, then so is f.