# MathJax Support

mdBook has optional support for math equations through MathJax.

To enable MathJax, you need to add the `mathjax-support`

key to your `book.toml`

under the `output.html`

section.

```
[output.html]
mathjax-support = true
```

Note:The usual delimiters MathJax uses are not yet supported. You can't currently use`$$ ... $$`

as delimiters and the`\[ ... \]`

delimiters need an extra backslash to work. Hopefully this limitation will be lifted soon.

Note:When you use double backslashes in MathJax blocks (for example in commands such as`\begin{cases} \frac 1 2 \\ \frac 3 4 \end{cases}`

) you need to addtwo extrabackslashes (e.g.,`\begin{cases} \frac 1 2 \\\\ \frac 3 4 \end{cases}`

).

### Inline equations

Inline equations are delimited by `\\(`

and `\\)`

. So for example, to render the
following inline equation \( \int x dx = \frac{x^2}{2} + C \) you would write
the following:

```
\\( \int x dx = \frac{x^2}{2} + C \\)
```

### Block equations

Block equations are delimited by `\\[`

and `\\]`

. To render the following
equation

\[ \mu = \frac{1}{N} \sum_{i=0} x_i \]

you would write:

```
\\[ \mu = \frac{1}{N} \sum_{i=0} x_i \\]
```