# Math

The Math plugin lets you include beautifully typeset math formulas in your slides. To get started, make sure that reveal.js is initialized with the math plugin enabled.

<script src="plugin/math/math.js"></script><script>  Reveal.initialize({ plugins: [ RevealMath.KaTeX ] });</script>

We're using the KaTeX typesetter in this example but you can also choose from MathJax 2 or 3.

Now that the plugin is registered we can start adding LaTeX formulas to our slides.

<section>  <h2>The Lorenz Equations</h2>  \begin{aligned} \dot{x} &amp; = \sigma(y-x) \\ \dot{y} &amp; = \rho x - y - xz \\ \dot{z} &amp; = -\beta z + xy \end{aligned}</section>

## The Lorenz Equations

\begin{aligned} \dot{x} & = \sigma(y-x) \\ \dot{y} & = \rho x - y - xz \\ \dot{z} & = -\beta z + xy \end{aligned}

## Markdown

If you want to include math inside of a presentation written in Markdown you need to wrap the formula in backticks. This prevents syntax conflicts between LaTeX and Markdown. For example:

<section data-markdown>  $$J(\theta_0,\theta_1) = \sum_{i=0}$$</section>

## Typesetting Libraries

The math plugin offers three choices of math typesetting libraries that you can use to render your math. Each variant is its own plugin that can be accessed via RevealMath.<Variant>. If you don't have a preference, we recommend going with KaTeX.

LibraryPlugin NameConfig Property
KaTeXRevealMath.KaTeXkatex
MathJax 2RevealMath.MathJax2mathjax2
MathJax 3RevealMath.MathJax3mathjax3

### KaTeX 4.2.0

Adjust options through the katex configuration object. Below is how the plugin is configured by default. If you don't intend to change these values you do not need to include the katex config option at all.

Reveal.initialize({  katex: {    version: 'latest',    delimiters: [      {left: '$$', right: '$$', display: true},      {left: '$', right: '$', display: false},      {left: '\$$', right: '\$$', display: false},      {left: '\$', right: '\$', display: true}   ],   ignoredTags: ['script', 'noscript', 'style', 'textarea', 'pre'] }, plugins: [ RevealMath.KaTeX ]});

Note that by default the latest KaTeX is loaded from a remote server (https://cdn.jsdelivr.net/npm/katex). To use a fixed version set version to, for example, 0.13.18.

If you want to use KaTeX offline you'll need to download a copy of the library (e.g. with npm) and use the local configuration option (the version option will then be ignored), for example:

Reveal.initialize({  katex: {    local: 'node_modules/katex',  },  plugins: [ RevealMath.KaTeX ]});

### MathJax 2

Adjust options through the mathjax2 configuration object. Below is how the plugin is configured by default. If you don't intend to change these values you do not need to include the mathjax2 config option at all.

Reveal.initialize({  mathjax2: {    mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@2/MathJax.js',    config: 'TeX-AMS_HTML-full',    // pass other options into MathJax.Hub.Config()    tex2jax: {      inlineMath: [ [ '$', '$' ], [ '\$$', '\$$' ] ],      skipTags: [ 'script', 'noscript', 'style', 'textarea', 'pre' ]    }  },  plugins: [ RevealMath.MathJax2 ]});

Note that the latest MathJax 2 is loaded from a remote server. To use a fixed version set mathjax to, for example, https://cdn.jsdelivr.net/npm/mathjax@2.7.8/MathJax.js.

If you want to use MathJax offline you'll need to download a copy of the library (e.g. with npm) and point mathjax to the local copy.

### MathJax 3 4.2.0

Adjust options through the mathjax3 configuration object. Below is how the plugin is configured by default. If you don't intend to change these values you do not need to include the mathjax3 config option at all.

Reveal.initialize({  mathjax3: {    mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js',    tex: {      inlineMath: [ [ '$', '$' ], [ '\$$', '\$$' ]  ]    },    options: {      skipHtmlTags: [ 'script', 'noscript', 'style', 'textarea', 'pre' ]    },  },  plugins: [ RevealMath.MathJax3 ]});

Note that the latest MathJax 3 is loaded from a remote server. To use a fixed version set mathjax to, for example, https://cdn.jsdelivr.net/npm/mathjax@3.2.2/es5/tex-mml-chtml.js. Additionally, the config is now part of of the url, by default tex-mml-chtml is loaded which recognizes mathematics in both TeX and MathML notation, and generates output using HTML with CSS (the CommonHTML output format). This is one of the most general configurations, but it is also one of the largest, so you might want to consider a smaller one that is more tailored to your needs, e.g. tex-svg.

If you want to use MathJax offline you'll need to download a copy of the library (e.g. with npm) and adjust mathjax accordingly.