Okay kiddo, let me simplify the concept of system of imprimitivity for you. Imagine you have a big puzzle with lots of pieces that can be put together to make a picture. Now, let's say each puzzle piece belongs to a certain group, like animals, colors or shapes.
In math, we call these groups "sets". A system of imprimitivity is like sorting the puzzle pieces into different sets based on some specific rule or characteristic.
For example, if we sort the puzzle pieces based on whether they have a red color or not, we have created a system of imprimitivity with two sets: one set of pieces that are red, and one set of pieces that aren't.
Systems of imprimitivity can be very helpful because they allow us to look at a problem in a simpler way, by grouping things that are similar together. And that's the basics of system of imprimitivity!