The main reason that I did not write much in my blog is that I did not know how to use LaTeX in a blog post.

It turns out that the answer is quite simple. Somehow I just did not figure out this easy solution. Anyway, here it is — using MathJax for equations, for example,

\[x^2+y^2=z^2\]

where \( x, y \) and \( z \) are three variables.

More information about using MathJax, please refer to this page.