ELI5: Explain Like I'm 5

Category of topological vector spaces

Okay kiddo, have you heard of vectors before? They are like arrows that have both a direction and a size. Imagine you have two vectors, and you can add them together by putting the tail of one vector on the tip of the other vector.

Now, a topological vector space is just a collection of vectors that also has a special structure called a topology. A topology tells us which sets of vectors are considered "close" to each other.

For example, let's say we have a collection of vectors that live in a plane. We can draw a circle around one of those vectors to capture all the vectors that are close to it (aka, within a certain distance of it).

But here's the tricky part: in a topological vector space, we also want to be able to add and multiply vectors together in a way that is continuous. That means when we add two vectors together, we don't want the result to suddenly jump to a faraway place in the space.

So, a category of topological vector spaces is a group of these vector spaces that all have the same type of structure and behave in a certain way. We can study them and see what kinds of mathematical properties they have, and how they can be used in real-life applications like physics or engineering.