ELI5: Explain Like I'm 5

Subspace topology

Okay kiddo, let's say you have a really big room with lots of furniture in it. We call it the "big space". Now let's say we want to focus on just one corner of that big space, like where the bookshelf is. We can make a smaller space out of that corner by putting up some invisible walls around it, so that only things in that corner count for our new space. We call that corner the "subspace".

Now, imagine that we want to understand how things in the subspace can go together, without worrying about the rest of the big space. We can use something called the "subspace topology" to help us with this.

The subspace topology tells us which parts of the big space are also part of the subspace. So, if we had a chair that was originally in the big space but is also in the corner we made into the subspace, we would count it as part of the subspace. But if there's a lamp on the other side of the room that's not near the bookshelf, we don't count that as part of our subspace.

By using the subspace topology, we can understand how things in the corner we picked fit together, without worrying about things that are far away or in separate parts of the big space. It's like looking at a puzzle piece up close, without worrying about the rest of the picture. Cool, huh?
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