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Posted: **Mon May 09, 2022 11:15 am**

: Q1 Theorem Let X T Be Topological Space Then X Is Closed Set Since T1 Space Iff X N U Su Is Open Set Containing 1 (9.84 KiB) Viewed 31 times

Q1)Theorem: Let (X,T)be topological space then {x}is closed set(since T1 - space) iff {x}=n{u ſu is open set containing x} - (2) Let (X,T)be co – countable space then X is not Tz – space