Lyapunov equation

The Lyapunov equation is like a math problem. We use it to try to figure out if something will stay or change over time. Imagine you have something and you want to see if it will keep the same or change. You can use the Lyapunov equation to figure that out. To do this, you put your thing into the equation and it will tell you if it will stay the same or if it will change.