1. The problem statement, all variables and given/known data Hi all. Please take a look at: http://books.google.com/books?id=9p...ts=peoLUp4z_M&sig=vaRVDMazSj10x0k4v4iGKCHni0o What do they mean by that hint? 3. The attempt at a solution First I want to find the divergence of the three vectors. Second, for the vectors which have a divergence equal to zero, I want to find the vector A so the rotation of A = B. But this is the part I am in doubt about - can you help? Sincerely, Niles.