l`s denote direction cosines and the dot represents the multiplication of the two matrices. And m,s,j take the values 1,2,3.
I guess you know the Kronecker delta means,
I have to prove the following.
lmj. lsj= delta ms m,j,s=1,2,3.
and lmj and lsj stands for direction cosine matrix. and (delta ms) is a Kronecker delta.
[b]2. Cant think of any
The Attempt at a Solution