ELI5: Explain Like I'm 5

Sato's fundamental theorem

Okay, let's imagine we have some coins. We can put them in a piggy bank, and we want to know how much money we have in there.

So, we start counting the coins. We notice that some coins are bigger and heavier than others, but they all have a value.

Now, imagine we have a LOT of coins. Like, thousands and thousands of them. Counting them one by one would take us forever!

That's where Sato's Fundamental Theorem comes in. It tells us that we can use a special method to quickly find out how much money we have in the piggy bank, without having to count every single coin.

This method is called "grouping coins by their value." It means that we group all the coins that have the same value, for example, all the pennies in one group, all the nickels in another group, and so on.

Then, we count how many coins we have in each group and multiply it by the value of the coin. For instance, if we have 10 pennies, we multiply 10 by 1 (because one penny is worth one cent) and get 10 cents.

Finally, we add up all the values we calculated, and that's how much money we have in the piggy bank!

So, thanks to Sato's Fundamental Theorem, we can save time and effort when counting coins by grouping them by their value and using simple multiplication. Cool, huh?