MathJax in blogger. How I did it.
Copy the code from http://irrep.blogspot.com/2011/07/mathjax-in-blogger-ii.html or from the bottom of this post. 1.Go to Layout then 2.Sidebar(Top) "Add Gadget" then 3.HTML from third party. and 4.Paste the code. That's it. $\star$ $\blacksquare$ $\Psi$ < script src=' http://cdn.mathjax.org/mathjax/latest/MathJax.js' type='text/javascript ' > MathJax . Hub . Config ({ HTML : [ "input/TeX" , "output/HTML-CSS" ], TeX : { extensions : [ "AMSmath.js","AMSsymbols.js" ], equationNumbers : { autoNumber : "AMS" } }, extensions : [ "tex2jax.js" ], jax : [ "input/TeX" , "output/HTML-CSS" ], tex2jax : { inlineMath : [ [ '$' , '$' ], [ "\\(" , "\\)" ] ], displayMath : [ [ '$$' , '$$' ], [ "\\[" , "\\]"...