diff --git a/_includes/head.html b/_includes/head.html
index c8b8c38..4f18c49 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -4,6 +4,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
 
   <title>{% if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}</title>
+  <script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" type="text/javascript"></script>
   <meta name='description' content='{% if page.description %}{{ page.description | strip_html | strip_newlines | truncate: 160 }}{% else %}{{ site.description }}{% endif %}'>
 
   <link rel="canonical" href="{{ page.url | replace:'index.html','' | absolute_url }}">