ELI5: Explain Like I'm 5

Hilbert's tenth problem

Okay kiddo, have you ever played with numbers and tried to find the solution to a problem? That's what mathematicians do too! They solve lots of problems using numbers and rules.

There was a mathematician named David Hilbert who was really good at solving problems. He had a list of ten difficult problems that he wanted other mathematicians to try and solve. The tenth problem on his list was extra tricky and nobody could solve it for a long time.

The problem was about something called Diophantine equations. Now, that might sound like a big and scary phrase, but it's really just another type of math problem. These equations use only whole numbers, no fractions or decimals allowed.

The question was, can we find an algorithm, or a set of rules, that can tell us whether or not a Diophantine equation has a solution? This means, can we find out if we can put some numbers into the equation and get an answer that works?

The reason this problem was so difficult was because it wasn't clear if there was an algorithm that could work for every single Diophantine equation. That's a lot of equations to go through and test!

A man named Yuri Matiyasevich eventually solved the problem in 1970, which means he found a way to show that some Diophantine equations do not have a solution. This was a big achievement in the world of math and helped us understand more about these types of equations.

So, in simpler terms, Hilbert's tenth problem was asking if we could find a set of rules to solve a certain type of math problem using only whole numbers. It was really hard to solve, but a smart man eventually figured it out!