Solution (source code)

= Solution

A rank-$k$ Cartesian <tensor> has components $T_{i_1\ldots i_k}$ transforming under an orthogonal change of <basis> $R$ as $T\prime_{i_1\ldots i_k}=R_{i_1j_1}\cdots R_{i_kj_k}T_{j_1\ldots j_k}$.