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I am working with symbolic tensors within Mathematica and I wanted to ask if there is a way to have a symbolic identity tensor.

Szabolcs
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relativeentropy
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  • See TagSet? E.g. id /: (id[n_].m_ /; Dimensions[m][[1]] == n) = m? You'll likely need a decent number of rules though, and the order they are input does matter. – eyorble Dec 04 '20 at 17:27
  • Related: https://mathematica.stackexchange.com/questions/28563/symbolic-tensor-simplifications-and-the-identity-matrix – Michael E2 Dec 05 '20 at 20:22
  • @MichaelE2 how to create a fourth order identity tensor in MMA? – ABCDEMMM Mar 23 '22 at 01:50

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