# Mimimal uncountable well ordered set, every section of which is countable

#### topsquark

##### Full Member
I was just reading an old Topology text and it is interesting how the method of presentation is rather different from the more modern texts.

I ran into an interesting comment on the definition of the ordinal numbers. It used $$\displaystyle \Omega$$ to define the ordinals and goes on to define the cardinals in a similar fashion. I must say I rather liked that presentation better then in my other texts.

This brings up a question that I've had for a while and I've managed to ask it on every new site I've gotten on. You all have some advanced members and questions so perhaps I should ask here, too: Is there an explicit representation of $$\displaystyle \Omega$$? I've never found one and it drives me a bit crazy because I think I should be able to construct it, since the concept of it is fairly straightforward. But I can't.

Thanks!

-Dan

#### pka

##### Elite Member
Dan, can you give some idea how far back the text you found go. Here is my situation. I spent three & half years studying point set topology (Moore spaces) with one of Moore's students( R L Moore if the god-farther of American topology) If you doubt that just take a look at his PhD students.
Here is what Keith Devlin has to say about MOORE

#### topsquark

##### Full Member
The text is "General Topolgy" by Willard (1970). Looks like it's a first edition. It's younger than I had thought. Based on the wear of the cover I thought it went back to the 50's. Still it is a bit different than I'm used to.

-Dan