LaTeX Equations on Blogger

1. In the sidebar, locate the Layout button
   
2. Locate the HTML/Javascript Gadget
   
3. In the Pop-up window, leave "Title" empty and copy-and-paste this code according to this post:
   <script src=\"http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML\" type=\"text/javascript\"> </script> 
   
   Or this, if you want the secure https protocol to fetch the javascript file.
   <script type=\"text/javascript\" src=\"https://d3eoax9i5htok0.cloudfront.net/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML\"> </script>
4. Now LaTeX equations can be written by $$a \neq b$$ or \[a \neq b\] for equation block, and $a \neq b $ for inline equations
   
   For example,
   $$ \sqrt{n}\left( \frac{1}{n}\sum_{i=1}^n x_i - \mu \right)\ \xrightarrow{d}\ \mathcal{N}(0,\,\sigma^2) $$
   yields $$ \sqrt{n}\left( \frac{1}{n}\sum_{i=1}^n x_i - \mu \right)\ \xrightarrow{d}\ \mathcal{N}(0,\,\sigma^2) $$