Normally preordered spaces and utilities

Abstract

In applications it is useful to know whether a topological preordered space is normally preordered. It is proved that every $k_ω$-space equipped with a closed preorder is a normally preordered space. Furthermore, it is proved that second countable regularly preordered spaces are perfectly normally preordered and admit a countable utility representation.

17 pages, 1 figure. v2 contains a second proof to the main theorem with respect to the published version. The last section of v1 is not present in v2. It will be included in a different work