V或 Y=DZ,VCCYr+1= Zr+1D = diag[yn= znf(X) = Z'(D'C'ACD)Z =z +z +... +z.则称之为复二次型f(X)的规范形85.3唯一性§5.3 唯一性 则 称之为复二次型 f X( ) 的规范形. 1 1 1 ( , , , 1 , , 1) r D diag d d = 1 1 1 1 1 1 1 r r r r r n n y z d y z d y z y z + +  =      =   =   =  , 或 Y = D Z , 2 2 2 1 2 ( ) '( ' ' ) r f X Z D C ACD Z z z z = = + + +