证:A为 Hermite矩阵 A=U AU, A=diag(n, n2,"An) xHAx (Ux)A(Ux R(x)=rHx (Ux)(Ux)返回 证: A为Hermite矩阵 1 2 , ( , , ) H A U U diag =   =    n x x x Ax R x H H ( ) = ( ) ( ) ( ) ( ) H H Ux Ux Ux Ux  =