The authors generalize t-semidefinite programming to any orthogonal transform M and characterize group-equivariant tensor multiplications via Schur's Lemma.
Spectral computation with third-order tensors using the t-product
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Tensor-Tensor Products, Group Representations, and Semidefinite Programming
The authors generalize t-semidefinite programming to any orthogonal transform M and characterize group-equivariant tensor multiplications via Schur's Lemma.