P=(m1,"2,…,"n),P=|0 A10 0 0 A=(v1,v2,…,Vn 0‖a2 00( , , , ), 1 2 n P = v v  v               = − T n T T P     2 1 1                           = T n T T n n A v v v                2 1 2 1 1 2 0 0 0 0 0 0 ( , , , )