ELI5: Explain Like I'm 5

Nuclear operators between Banach spaces

Ok kiddo, so imagine you have two toy boxes, and each toy box has different toys inside. These toy boxes are like two different groups of things called Banach spaces. And now, you are the nuclear operator that can move toys from one toy box to another.

But here's the catch: you can only move certain types of toys, and you have to make sure that they will fit inside the other toy box. This is like being a nuclear operator between Banach spaces, where you can only move certain functions or elements from one Banach space to another, and you have to make sure they make sense in the new space.

Think of it like playing a matching game, where you have to find the right toy in one box that matches a space in the other box. And just like how you have to be careful not to break any toys or make a mess, a nuclear operator has to be careful not to mess up any mathematical rules or properties when moving elements between Banach spaces.

So that's the basics of being a nuclear operator between Banach spaces, it's like moving toys between two different toy boxes but making sure everything still makes sense and follows the rules.