Tietze extension theorem
type: Concept
preferred label: قضیه توسیع تیتز @fa
related: normal space

closed extension topology
type: Concept
preferred label: توپولوژی توسیع بسته @fa
related: normal space

Urysohn lemma
type: Concept
broader: normal space
preferred label: لم اوریسون @fa

normal space
type: Concept
broader: topological space
narrower: Urysohn lemma
preferred label: فضای نرمال @fa
related: closed extension topology
related: Tietze extension theorem

topological space
type: Concept
narrower: normal space
preferred label: فضای توپولوژیک @fa