Geodesic
On the classification of isotropic tensors
Glasgow mathematical journal, Tome 29 (1987) no. 2, pp. 185-196

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A tensor is said to be isotropic relative to a group of transformations if its components are invariant under the associated group of coordinate transformations. In this paper we review the classification of tensors which are isotropic under the general linear group, the special linear (unimodular) group and the rotational group. These correspond respectively to isotropic absolute tensors [4, 8] isotropic relative tensors [4] and isotropic Cartesian tensors [3]. New proofs are given for the representation of isotropic tensors in terms of Kronecker deltas and alternating tensors. And, for isotropic Cartesian tensors, we provide a complete classification, clarifying results described in [3].In the final section of the paper certain derivatives of isotropic tensor fields are examined. 
Appleby, P. G.; Duffy, B. R.; Ogden, R. W. On the classification of isotropic tensors. Glasgow mathematical journal, Tome 29 (1987) no. 2, pp. 185-196. doi: 10.1017/S0017089500006832
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