I came across this excellent tutorial when I tried to add mathjax support to my jekyll site.

Here’s a brief summary:

• In the _config.yml, add the following lines:
  # Build settings
markdown: kramdown

• On the top of the posts that you’d like to add mathjax support (it’s called the YAML ‘‘front matter’’) , add the following line:
  usemathjax: true

• Add these lines to _includes/head.html:

<!-- for mathjax support -->
{% if page.usemathjax %}
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
TeX: { equationNumbers: { autoNumber: "AMS" } }
});
</script>
<script type="text/javascript" async src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
{% endif %}


• After that, simply wrap the math symbols with two double-dollar sign $$: $$E=mc^2


You should be able to see it in your post as: $E=mc^2$

## Reference:

[1]: https://alan97.github.io/random/mathjax/