Proof That a Two Element Space With the Indiscrete Topology is Not a T0 Space


Letwith the indiscrete topology is not a T0 space.


A spaceis a T0 space if for any two distinct elementsthere is an open neighbourhood of one which does not contain the other.

With the indiscrete topologywe cannot separate 0 from 1 or 1 from 0 henceis not a T0 space.

Consider the setwith the topologyFor the distinct points 0 and 1, an open setexists such thatbut henceis a T0 space.

Each metric space is a T0 space since for distinct pointsandthere existssuch thathencebut

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