H-covering Maps in Descriptive Function Theory

We study the preservation of complete metrizability under maps between metric spaces.

Two main approaches have been developed in this area: one based on the behavior of maps on countable compact sets, and another based on abstract conditions such as stability.

In earlier work the author introduced the class of H-covering maps and proved that every such map is stable.

The main result of this paper is the converse: a map is H-covering if and only if it is stable.

This provides a concrete and practical description of stable maps and offers a unified framework for completeness-preserving mappings.