8楼: Originally posted by alober at 2017-06-20 10:30:27
x_{n+1} = \frac{1}{p}x_n-\frac{1}{p}y_n = \frac{1}{p}(\frac{1}{p}x_{n-1}-\frac{1}{p}y_{n-1})-\frac{1}{p}y_n = \frac{1}{p^2}x_{n-1}-(\frac{1}{p^2}y_{n-1}+\frac{1}{p^1}y_n) = \cdots = \frac{1}{p^n}x_1- ...