ELI5: Explain Like I'm 5

Totally bounded

Okay kiddo, imagine you have a bunch of toys and you want to put them all in a box. But you notice that the box isn't big enough to fit all the toys in it. So, what can you do?

Well, you can try to organize the toys so they take up as little space as possible, right? That's kind of like what mathematicians mean when they talk about something being "totally bounded."

You see, in mathematics, we often talk about sets of numbers. Like, let's say we have a set of numbers that are all between 0 and 1. That's a pretty big set, right? But if we want to study that set or do things with it, sometimes it helps to make it smaller.

That's where totally bounded comes in. A set of numbers is totally bounded if we can find a way to organize all the numbers so they take up as little space as possible. Kind of like how we can organize toys in a box.

For example, let's say we have a set of numbers that are all between 0 and 10. That's a pretty big set too, right? But if we use our toy-box organizing skills, we might be able to split up that set into smaller sets that all fit inside little boxes.

We might have one little box for numbers between 0 and 2, another box for numbers between 2 and 4, and so on. By doing this, we've made the set smaller, but we haven't left out any numbers.

That's what being totally bounded is all about. It means we can break up a big set into smaller pieces that fit inside little boxes, without leaving out any numbers.

Does that make sense, kiddo?