ELI5: Explain Like I'm 5

Einstein–Brillouin–Keller method

Imagine you have a really big puzzle with thousands of tiny pieces. You want to figure out how to put it all together but it's really hard to do it all at once. So, you decide to take a few pieces at a time and work on them to figure out how they fit together. This is kind of like what the Einstein-Brillouin-Keller method does but with very complicated math problems instead of puzzles.

The Einstein-Brillouin-Keller method is a way to break down really complicated math problems into smaller, more manageable pieces. This makes it easier for scientists and mathematicians to study and understand.

The method uses something called "action" to describe the motion of particles in a system. These actions are like little clues that can help us understand how particles move and interact with each other. We can then use these clues to figure out how the particles behave over time.

Instead of trying to solve the whole problem at once, physicists can use the Einstein-Brillouin-Keller method to tackle little pieces of it and then put them all together. It's like doing a complicated dance routine where you learn one step at a time and then piece it all together at the end.

Overall, the Einstein-Brillouin-Keller method is a really useful tool for scientists and mathematicians who work with really complicated problems. It helps them break down those problems into smaller, more manageable pieces so they can understand them better.