ELI5: Explain Like I'm 5

Noetherian topological space

Imagine you have a big box of toys, and you want to organize them in a certain way. One way to do this is to put all the toys of the same kind together, like all the cars in one pile, all the dolls in another pile, and so on. Now imagine you have a lot of different kinds of toys, and you want to keep organizing them according to this method.

A noetherian topological space is like this big box of toys, but instead of toys, you have a bunch of sets that you want to organize according to a certain rule. This rule is called the "noetherian" property, and it basically means that you can't keep dividing up a set into smaller and smaller pieces forever.

To put this in more technical terms, a noetherian topological space is a space where every descending chain of closed sets (think of these as the piles of toys in the example) eventually stabilizes. This means that if you start with a big closed set and start breaking it down into smaller and smaller ones, you will eventually reach a point where you can't break it down any further.

So just like organizing toys, organizing sets in a noetherian topological space means that you can always group them together in a meaningful way, without having to worry about endless divisions.

In summary, a noetherian topological space is a fancy name for a space where you can always organize sets according to a set of rules without getting lost in endless divisions.