ELI5: Explain Like I'm 5

Minkowski–Bouligand dimension

Minkowski-Bouligand dimension is a way to measure the roughness or "bumpiness" of a shape or surface, like a mountain range or a coastline. Scientists and mathematicians use this measurement to help describe and understand the shapes and structures of things in our world.

Here's how it works: imagine you have a piece of paper with a wavy line drawn on it. If you zoom in really closely on that line, you'll see that it's made up of many little bumps and wiggles - these are called "fractal" patterns. The more bumps and wiggles there are in the line, the higher the Minkowski-Bouligand dimension of that line.

Now, suppose you want to measure the Minkowski-Bouligand dimension of a mountain range. First, you'd need to pick a scale or "resolution" at which to examine the mountain range. For example, you might look at a satellite image of the range and measure the length of the shortest line segment that still captures its roughness. Then, you'd zoom in on that segment and count how many bumps and wiggles there are along it.

Next, you'd increase the scale (or resolution) and repeat the process of counting bumps and wiggles along similarly-sized line segments. As you go to larger scales, you'll find that the number of bumps and wiggles along each segment decreases, since you're "smoothing out" the roughness of the mountain range.

By comparing the number of bumps and wiggles at each scale, you can calculate the Minkowski-Bouligand dimension of the mountain range. This dimension tells you how "fractal" or bumpy the mountain range is at different scales, and can give you insights into the structure and formation of the range as a whole.