# [topology] new kind of separation axiom? where does it fit in?

1. Dec 25, 2011

### nonequilibrium

Hello,

Just out of curiosity, where would following "seperation axiom" fit in?

So far I'm only acquainted with the T1, T2, T3 and T4 axioms (and the notion of completely regular in relation to the Urysohn theorem).

Last edited: Dec 25, 2011
2. Dec 25, 2011

### micromass

Staff Emeritus
You mean A and B disjoint right??

Can't you always take $U=X\setminus A$??

3. Dec 26, 2011

### nonequilibrium

Haha...

(and yes I meant A and B disjoint)

It seems I hadn't thought this one true :) thanks a lot!