Fundamental lemma

The fundamental lemma is a fancy phrase used in math to describe an important rule about how to solve certain problems. Imagine you have a big puzzle with lots of pieces that you need to put together. But, instead of pictures on the pieces, you only have numbers and letters.

The fundamental lemma is like a secret code that helps you figure out how to put the pieces together and solve the puzzle. It tells you how certain numbers and letters relate to each other and what you can do with them.

So, when you see the words "fundamental lemma," just remember that it's a special code that helps math experts solve puzzles and figure out how to put things together.