---
layout: post
title: a post with math
date: 2015-10-20 11:12:00-0400
description: an example of a blog post with some math
---
This theme supports rendering beautiful math in inline and display modes using [KaTeX](https://khan.github.io/KaTeX/) engine. You just need to surround your math expression with `$$`, like `$$ E = mc^2 $$`. If you leave it inside a paragraph, it will produce an inline expression, just like $$ E = mc^2 $$.

To use display mode, again surround your expression with `$$` and place it as a separate paragraph. Here is an example:

$$
\left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)
$$

Note that [KaTeX](https://khan.github.io/KaTeX/) is work in progress, so it does not support the full range of math expressions as, say, [MathJax](https://www.mathjax.org/). Yet, it is [blazing fast](http://www.intmath.com/cg5/katex-mathjax-comparison.php).