ELI5: Explain Like I'm 5

Monochromatic triangle

Okay little buddy, so when we talk about a monochromatic triangle we're talking about a triangle that is all one color. It's like if you were coloring with your crayons and you decided to color a whole triangle in with just one color, like all red or all blue.

Now, why is this important? Well, sometimes in math and science we like to study patterns and shapes to see if there are any special things we can learn about them. And one of the things we've discovered is that if you have a bunch of points (like dots) on a piece of paper, and you color them in with just two colors (like black and white), sometimes you can find a monochromatic triangle. This means you can find three dots that are all connected to each other, and they're all the same color.

This might not seem that exciting, but it turns out that finding a monochromatic triangle can tell us some really interesting things about how the dots are arranged and how they're connected. Mathematicians have been studying different patterns like this for hundreds of years, and there's still so much to discover!