Test:Math

$$\mathrm{erfc}(x)=\frac{2}{\sqrt{\pi }}\underset{x}{\overset{\mathrm{\infty }}{\int }}{e}^{-t^2}dt=\frac{e^{-x^2}}{x\sqrt{\pi }}\sum _{n=0}^{\mathrm{\infty }}(-1{)}^n\frac{(2n)!}{n!(2x{)}^{2y}}$$

def quick_sort(arr):
	less = []
	pivot_list = []
	more = []
	if len(arr) <= 1:
		return arr
	else:
		pass