ELI5: Explain Like I'm 5

Kallman–Rota inequality

So, imagine you and your friend are playing with marbles. You have a bunch of marbles, and your friend has some too. But you both have different numbers of marbles, and you want to figure out if one of you has more than the other.

The Kallman-Rota inequality can help you figure this out! It says that if you take the total number of marbles you have and multiply it by the total number of marbles your friend has, that number will always be bigger than or equal to the difference between the two numbers of marbles, squared.

For example, let's say you have 4 marbles and your friend has 6 marbles. 4 times 6 is 24, and the difference between your numbers of marbles is 2 (6 minus 4). If we square that, we get 4. And 24 is indeed bigger than or equal to 4, so the Kallman-Rota inequality holds true!

This law can help us compare different sets of numbers or objects and figure out which one is bigger or smaller. Pretty cool, huh?