A more physical example.

Another example:

$$\hat{H}\left|\Psi\right>=i\hbar\partial_{t}\left|\Psi\right>$$

Schrödinger Equation  by Erwin Schrödinger
$$\hat{H}\left|\Psi\right>=i\hbar\partial_{t}\left|\Psi\right>$$
I am really looking forward to having fun with this blog :-D.