Add the following into extend_head.html

{{ if or .Params.math .Site.Params.math }}
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/katex.min.css"
  integrity="sha384-AfEj0r4/OFrOo5t7NnNe46zW/tFgW6x/bCJG8FqQCEo3+Aro6EYUG4+cU+KJWu/X" crossorigin="anonymous">
<script defer src="https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/katex.min.js"
  integrity="sha384-g7c+Jr9ZivxKLnZTDUhnkOnsh30B4H0rpLUpJ4jAIKs4fnJI+sEnkvrMWph2EDg4" crossorigin="anonymous"></script>
<script defer src="https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/contrib/auto-render.min.js"
  integrity="sha384-mll67QQFJfxn0IYznZYonOWZ644AWYC+Pt2cHqMaRhXVrursRwvLnLaebdGIlYNa" crossorigin="anonymous" onload="renderMathInElement(document.body, 
//   The following is to parse inline math equation
  {
      delimiters: [
                  {left: '$$', right: '$$', display: true},
                  {left: '\\[', right: '\\]', display: true},
                  {left: '$', right: '$', display: false},
                  {left: '\\(', right: '\\)', display: false}
              ]
          }
);"></script>
{{ end }}

Then in the markdown file, in the header section we add math: true.

Methods to Show Math

The the above setup, you can use the following ways in the markdown writeup.

\\(E=mc^2\\) 
$$E=mc^2$$
$E=mc^2$