Add support of MathJax for Hexo.
$ npm install hexo-renderer-mathjax --save
Edit _config.yml:
plugins:
- hexo-renderer-mathjax
Write the following latex code:
$$
\frac{\partial u}{\partial t} = h^2 \left( \frac{\partial^2 u}{\partial x^2} + \frac{\partial^2 u}{\partial y^2} + \frac{\partial^2 u}{\partial z^2}\right)
$$
Then you will get:
