While standard LaTeX is all that is needed for most simple mathematical formulae and equations, sometimes more symbols and tools are needed. There are multiple packages available that will enhance your equations and provide you with more to work with. Three of the main packages are described below. Remember, to load a package, type `\usepackage{package}`

in your document preamble.

`amsmath`

The `amsmath`

package is an incredibly useful package. It is used to allow your equations to be centered but not numbered, as in `\begin{equation*}`

, it is used to create matrices (as described below) and it introduces many other useful commands, such as `\overset`

and `\underset`

, described below. The `amsmath`

package documentation can be found here.

`mathtools`

The `mathtools`

package builds off of the `amsmath`

package, adding further useful symbols and tools. It automatically loads the `amsmath`

package, so you do not need to load both in your document preamble. The `mathtools`

documentation can be found here.

`amssymb`

The `amssymb`

package provides many extra symbols that can be very handy for more complex equations. The `amssymb`

documentation can be found here.

**Font packages**

There are also various fonts you can use for your equations, as described on this question on the TeX stack exchange, for TeX, LaTeX, and friends.

This paper is a concise explanation of the different features provided by some packages as well as standard LaTeX; it is very helpful.