This is a minimal working example. To update preview, you can either
use the shortcut `Ctrl + Enter`

or click the
`update preview`

submenu under the `Preview`

menu
in the toolbar.

## Math formula

Anything between two `$`

characters will be treated as TeX
math, for example,
. For
display math, use `$$`

delimiters.

## Numbering and referencing

For any real number , we have The equation is the power series definition of the exponential function, and the equation is known as Euler’s formula.

## LaTeX package

To use a LaTeX package, include it in the `latex preamble`

submenu under the `Meta`

menu. Here is an example of using
`tikz-cd`

package:

## Theorem-like environment

No three positive integers , , and satisfy the equation for any integer value of greater than .

I have a proof of this theorem, but there is not enough space.

You need not remember the exact syntax, the editor will help you with that.

## Bibliography

Einstein’s journal paper (Einstein 1905) and Dirac’s book (Dirac 1981) are physics-related items.

## Reference

*The Principles of Quantum Mechanics*. International Series of Monographs on Physics. Clarendon Press.

*Annalen Der Physik*322 (10): 891–921.