2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/158409We describe the structure of 0-simple countably compact topological inverse semigroups and the structure of congruence-free countably compact topological inverse semigroups.Group TheoryGeneral Topology20M18; 22A15On countably compact 0-simple topological inverse semigroupstext