### Sidebar

equations:klein-gordon_equation

This is an old revision of the document!

# Klein-Gordon Equation

## Why is it interesting?

It's the correct equation of motion that describes free spin $1$ particles.

## Layman

Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party.

## Researcher

The motto in this section is: the higher the level of abstraction, the better.
Common Question 1
Common Question 2

Example1
Example2: