ELI5: Explain Like I'm 5

Cahen–Mellin integral

Have you ever had to add up a bunch of numbers? It can take a while, right? But what if there was a faster way to add them up? Well, that's what the Cahen-Mellin integral is!

Imagine that you have a bunch of numbers arranged in a line. The Cahen-Mellin integral helps you add up all of those numbers very quickly.

Here's how it works: instead of adding up all the numbers one by one, you draw a special line through the numbers. This line has a special shape called a logarithmic spiral. It looks a bit like a snail shell winding around and around.

Once you've drawn the spiral line, you use something called a complex number to "measure" the numbers along the line. This is a special kind of number that has two parts - a "real" part and an "imaginary" part.

So, as you measure the numbers along the spiral line with these special complex numbers, you add them up more quickly than you would just by adding them one by one. And that's the Cahen-Mellin integral in a nutshell - a faster way to add up a bunch of numbers!