$x_0$

$\left(\text{1},\text{1},\cdots ,\text{1}\right)$

$\left(0,0,\cdots ,0\right)$

$\left(1,0,1,0,\cdots \right)$

$\left(0,\text{1},0,\text{1,}\cdots \right)$

$\left(\text{1},\text{2},\text{3},\cdots \right)$

表现形式

−b+

−go

−r*

−mx

−yd