2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/113848We give a short proof of the well-known fact that the unit interval [0,1] is uncountable by means of a simple infinite game. We also show using this game that a (non-empty) perfect subset of [0,1] must be uncountable.7 pagesHistory and OverviewGeneral Topologytext