ELI5: Explain Like I'm 5

Divisorial scheme

Okay, so imagine you have a big cake. You need to cut it into equal pieces for all your friends. To do this, you need to figure out how many pieces you can make and how big each piece will be.

Now, in math, sometimes we have things called schemes. These are like shapes or spaces we want to study. Now, sometimes we want to divide these schemes into smaller parts, kind of like how we divided the cake into pieces. But we don't want to just divide them randomly. We want to divide them in a certain way that helps us understand them better.

This is where the idea of divisorial schemes comes in. A divisor is like a guideline for cutting the scheme into parts. It's a special type of sub-scheme that tells us how to divide things up. So just like we used a knife to cut the cake, we use a divisor to cut the scheme.

Divisorial schemes are interesting because they tell us a lot about the geometry and structure of the scheme we're studying. They help us understand how it's put together and what different parts are made of. And just like the cake pieces are all equal in size, when we use divisors to cut schemes, we get parts that are all related in a similar way.

So that's what a divisorial scheme is! It's like dividing a cake, but with math instead of food. We use special guidelines called divisors to help us cut up a shape or space into smaller parts. This helps us understand the shape better and see how it's built.