diff --git a/_includes/head.html b/_includes/head.html
new file mode 100644
index 0000000..993f197
--- /dev/null
+++ b/_includes/head.html
@@ -0,0 +1,10 @@
+<script type="text/javascript" id="MathJax-script" async
+  src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js">
+</script>
+<script>
+  MathJax = {
+    tex: {
+      inlineMath: [['$', '$']]
+    }
+  };
+</script>