How to enable math in JekyII

As a scientific worker, math description is inevitable. Latex is powerful and necessary tool for those writing scientific paper or notes. To share the idea or work online, I am searching for easy way to display the math.

My first trial is JekyII and MathJax, which is simple to set up.

Edit the _config.yml to use kramdown as the markdown

   
   markdown: kramdown
   kramdown:
     math_engin: mathjax

Add the Mathjax in the template _layout\post.html

   <article ...>
   ...
    <script type="text/javascript"
        src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
    </script>
   </article>

Now you can enjoy playing with math

Inline expression like $E = m c^2$
```
Inline expression like $$ E = m c^2 $$
```
Block expression

$\begin{align} f(x) & \sim \mathcal{GP}(\mathcal{K}) \tag{1}\\ g(x) & = ax + b \tag{2} \end{align}$

$$
\begin{align}
f(x) & \sim \mathcal{GP}(\mathcal{K}) \tag{1}\\
g(x) & = ax + b \tag{2}
\end{align}
$$