Testing mathjax library

Time to write some math!

$a = b + c$

import numpy as np

Test inline math: $a = b + c$

Test centered math:

$$k_{n+1} = n^2 + k_n^2 - k_{n-1}$$

Another example:

$$mean = \frac{\displaystyle\sum_{i=1}^{n} x_{i}}{n}$$

support for chinese: 你好我是徐炫东

$l = |x| + \lambda*(\theta)$