2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/136149In this paper, we discuss the basic properties of Alexandroff spaces. Several examples of Alexandroff spaces are given. We show how to construct new Alexandroff spaces from given ones. Finally, two invariants for compact Alexandroff spaces are defined and calculated for the given examples.10 pagesGeneral Topology54-02text