Studies of certain classes of functions and its connection with $S$-embeddedness

TL;DR

This paper explores the properties of hard-bounded functions and S-embedded subsets in topological spaces, providing characterizations and studying related function classes to deepen understanding of their extension properties.

Contribution

It offers a characterization of the converse of S-embeddedness and investigates properties of functions bounded away from zero on hard subsets.

Findings

Every S-embedded subset is C*-embedded.

Characterization of the converse of S-embeddedness.

Properties of functions bounded away from zero on hard subsets.

Abstract

We call a function $f$ in $C(X)$ to be hard-bounded if $f$ is bounded on every hard subset, a special kind of closed subset, of $X$. We call a subset $T$ of $X$ to be $S$-embedded if every hard-bounded continuous function of $T$ can be continuously extended upto $X$. Every $S$-embedded subset is $C^*$-embedded. In this paper we have given a characterization of the converse part. To get the converse, we came across a type of function which are bounded away from zero on every hard subset of a subset. We further studied few properties of this type of functions and also of hard-bounded functions.