# 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 add two extra backslashes (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 \$