let T be a linear transformation from V to V. suppose V=s(1)+s(2)+,,,+s(k), where each subspace s(i) is invariant under T. if T can be represented on s(i) by the matrix Bi, show that T can be represented on V by the matrix
[0 B2 000000]
[00 B3 00000]
[ ............... ]
[ 0000000 Bk]
i have no idea what to do. please help.