注:① 由 L(8,2,",8,)= L(n,n2,".,n,), i=1,2,.",n知,若(n,n2,*,nn)=(c1,82,..,e,)T,则过渡矩阵T=(t)是上三角形(即t=0,i>j)且 t,>0, i=1,2,",n9.2标准正交基AD§9.2 标准正交基 则过渡矩阵 T t = ( )ij 是上三角形(即 t i j ij = 0, ) 注: 0, 1,2, , ii 且 t i n = ① 由 1 2 1 2 ( , , , ) ( , , , ), 1,2, , L L i n i i = = 1 2 1 2 ( , , , ) ( , , , ) , 知,若 n n = T