normal space
topological space in which every pair of disjoint closed sets has disjoint open neighborhoods
ProofWiki: Definition:T4_SpaceMathWorld: NormalSpace
Wikipedia (English): Normal_space
Wikidata: normal space
nLab: normal space
mathswitch — infrastructure for relaying and exchanging mathematical concepts
topological space in which every pair of disjoint closed sets has disjoint open neighborhoods
ProofWiki: Definition:T4_Space