Cohen ring

Okay, so imagine you have a special box that you can only put certain things in. This box is called a Cohen ring. It's a really cool box because it can only hold a certain type of object called an ideal.

Now, an ideal is a special group of numbers that have certain properties, like being able to add, subtract and multiply together in a specific way. And these numbers all fit perfectly inside the Cohen ring box.

Think of it like a puzzle where all the pieces have to fit together exactly right or the puzzle doesn't work. The Cohen ring is like a box that only fits a certain type of puzzle piece - the ideal - and it makes the puzzle work perfectly.

So when mathematicians talk about the Cohen ring, they're really talking about this special box that holds these special puzzle pieces called ideals. And by studying these ideals and how they fit together in the Cohen ring, mathematicians can learn a lot about how numbers work and how they relate to each other.