1. The problem statement, all variables and given/known data In En the quantities Bij are the components of an affine tensor of rank 2. Construct two affine tensors each of rank 4, with components Cijkl and Dijkl for which ∑k ∑l Cijkl Bkl = Bij + Bji ∑k ∑l Dijkl Bkl = Bij - Bji are identities. 2. Relevant equations 3. The attempt at a solution Can anyone give me a hint on how to start? I just don't know how to start.