MathJax.Hub.Config({
    "tex2jax": { inlineMath: [ [ '$', '$' ] ] }
  });
  MathJax.Hub.Config({
    config: ["MMLorHTML.js"],
    jax: ["input/TeX", "output/HTML-CSS", "output/NativeMML"],
    extensions: ["MathMenu.js", "MathZoom.js"]
  });