Hi, 1. The problem statement, all variables and given/known data The components of the tensor Ai j are A1 2 = A2 1 = A, whereas all the other components are zero. I am asked to write A(BAR)i j, following a transformation to a new coordinate system, given that ∂q(BAR)k/∂qn = Rnk. I am expected to write my answer in terms of R. 2. Relevant equations 3. The attempt at a solution I know that A(BAR)i j = ∂q(BAR)i/∂qm * ∂q(BAR)j/∂qn * Am n But how may I proceed?