1. The problem statement, all variables and given/known data I need to calculate Ax(BxC) -A, B, C are vectors, apart from bac-cab rule, I need to get it by epsilon ijk -Following I will note it by e(ijk). 2. Relevant equations I expect answerer to know kronecker delta equation and vector multiplications. 3. The attempt at a solution e(ijk)*A(i)*(B*C)(j) = e(ijk)*A(i) (BxC)(j) = e(mjn)B(n)C(m) After that part I'm stuck. As you can see below, I rotate the ijk's and mjn's to match j's at the end, but I fail. e(ijk)*A(k)*e(mjn)*B(n)*C(m) Can you help me after that? Lettters in parantheses (i, j, k, m, n) are supposed to indicate the indices.