It’s really easy. Just add the following code above <head> in blogger’s template:
<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"> </script>And you can test it now! \( J_\alpha(x) = \sum\limits_{m=0}^\infty \frac{(-1)^m}{m! \, \Gamma(m + \alpha + 1)}{\bigl({\frac{x}{2}}\bigr)}^{2 m + \alpha} \)
\( J_\alpha(x) = \sum\limits_{m=0}^\infty \frac{(-1)^m}{m! \, \Gamma(m + \alpha + 1)}{\bigl({\frac{x}{2}}\bigr)}^{2 m + \alpha} \)