Search for: [Abstract = "A simpler proof is given for Rychlewski's theorem that clarifies the ideal of extending a g\-invariant function into a function which is invariant under a larger group. For an anisotropic solid, the theorem ensures the possibility of transforming the problem of representation of an anisotropic constitutive function into a representation of an isotropic function through some tensors characterizing the symmetry group. The structural tensors for all 32 crystal groups are presented. The structural tensors for all the orthogonal subgroups of non\-crystal symmetries are also investigated."]

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