2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/135555Martin's Axiom for $σ$-centered partial orders implies that there is a cosmic space with non-coinciding dimensions.2005-11-15: new version, largely rewrittenGeneral TopologyLogic54F45 (Primary); 03E50, 54E20 (Secondary)text