katex-header.html

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.10.0/dist/katex.min.css" integrity="sha384-9eLZqc9ds8eNjO3TmqPeYcDj8n+Qfa4nuSiGYa6DjLNcv9BtN69ZIulL9+8CqC9Y" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/katex@0.10.0/dist/katex.min.js" integrity="sha384-K3vbOmF2BtaVai+Qk37uypf7VrgBubhQreNQe9aGsz9lB63dIFiQVlJbr92dw2Lx" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/katex@0.10.0/dist/contrib/auto-render.min.js" integrity="sha384-kmZOZB5ObwgQnS/DuDg6TScgOiWWBiVt0plIRkZCmE6rDZGrEOQeHM5PcHi+nyqe" crossorigin="anonymous"></script>
<script>
  document.addEventListener("DOMContentLoaded", function() {
    renderMathInElement(document.body, {
      delimiters: [{
          left: "$$",
          right: "$$",
          display: true
        },
        {
          left: "\\(",
          right: "\\)",
          display: false
        },
        {
          left: "$",
          right: "$",
          display: false
        },
        {
          left: "\\[",
          right: "\\]",
          display: true
        }
      ]
    });
  });
</script>