```md
$$\begin{vmatrix}a & b\\
c & d
\end{vmatrix}=ad-bc$$
```

$$\begin{vmatrix}a & b\\
c & d
\end{vmatrix}=ad-bc$$

You can also do inline math like $e^{2i\pi} = 1$ .

Obsidian uses [Mathjax](http://docs.mathjax.org/en/latest/basic/mathjax.html). You can check which packages are supported in Mathjax [here](http://docs.mathjax.org/en/latest/input/tex/extensions/index.html).