This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

import numpy as np
A = np.array([[1,2],[3,4]])
np.linalg.inv(A)

插入公式的例子 \({f(x)=a_nx^n+a_{n-1}x^{n-1}+a_{n-2}x^{n-2}}+\cdots \tag{1.1}\)

Headings are cool

You can have many headings

Aren’t headings cool?