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Table of symbols and their associated definitions
| Symbol | Definition |
|---|---|
| , X, x, x | Tensor, Matrix, Column Vector, Scalar |
| X(n) | n-mode matricization of a tensor |
| X(r, :) | rth row of X |
| X(:, r) | rth column of X |
| A(n) | nth factor matrix |
| ‖a‖2, ‖A‖F | l2 norm, Frobenius norm |
| * | Hadamard (elementwise) product |
| ○ | outer product |
| ⊗ | Kronecker product |
| ⊙ | Khatri-Rao product (column-wise ⊗) |
