fix empty

_includes/mathjax-custom.html

@@ -0,0 +1,24 @@
+<script type="text/x-mathjax-config">
+  MathJax.Hub.Config({
+    extensions: ["tex2jax.js"],
+    jax: ["input/TeX", "output/HTML-CSS"],
+    tex2jax: {
+      inlineMath: [ ['$','$'], ["\\(","\\)"] ],
+      displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
+      processEscapes: true
+    },
+    "HTML-CSS": { availableFonts: ["TeX"] }
+  });
+
+
+  MathJax.Hub.Register.MessageHook("Math Processing Error",function (message) {
+    alert("Math Processing Error: "+message[1]);
+    });
+  MathJax.Hub.Register.MessageHook("TeX Jax - parse error",function (message) {
+    alert("Math Processing Error: "+message[1]);
+    });
+</script>
+
+
+<script type="text/javascript" async src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML">
+</script>