Here are some basics to get you started with $\LaTeX$ equations in this Jekyll installation. This post assumes that you already know how to write an equation in LaTeX and how to add a post on this website using markdown syntax.

## Starting a new markdown file

You will need to set the variable `use_math`

to `true`

in the front matter of the file (header of the markdown).
In this case, the front matter looks like that:

```
---
layout: article
title: "Introduction to LaTeX with MathJax"
categories: articles
tags: [howto, latex, jekyll]
use_math: true
---
```

## Writing equations

In-line equation:

```
This is a test with $ A = B_x $ as an inline equation.
```

Result:

This is a test with $ A = B_x $ as an inline equation.

Equation without numbers:

```
$$
A_1 = B_x
$$
```

Result:

Equations with numbers

```
$$
\begin{equation}
A = \frac{1}{n} \sum_i^n B_i
\end{equation}
$$
```

Result:

## How to change the configuration of MathJax

We store the configuration of MathJax in `/includes/mathjax_support.html`

.