EntityQ1193403· pop 17· linked from 69 articlesregular spaceSign in to savetopological space in which a point and a closed set are, if disjoint, separable by neighborhoodsConnectionsKolmogorov spaceEntitytopological spaceEntityneighborhoodEntityHausdorff spaceEntityclosed setEntitycompletely regular spaceEntityseparated setsEntitycompletely Hausdorff spaceEntitymathematicsEntityInternational Standard Book NumberEntitymathematical analysisEntitytopologyEntitypointEntitytheoremEntityAndrey KolmogorovEntitysubsetEntitycontinuous functionEntitydiskEntitymetric spaceEntitymanifoldEntityCategoriesProperties of topological spacesSeparation axioms