Anisotropic extension of the Walpole–Kelvin equivalence criterion
Let GGG be a subgroup of SO(3)\mathrm{SO}(3)SO(3), let T\mathbb{T}T be a tensor space with its GGG-representation, and let C∈[T⊗ST]G\mathrm{C}\in\left[\mathbb{T}\otimes^S\mathbb{T}\right]^GC∈[T⊗ST]G. Writ…