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  • Definition: The trace of an n X n matrix A = [a_ij] is the sum of the entries on its main diagonal and is denoted by tr(A). That tr(A) = a_11 + a_22 + ... + a_nn.

    Source: Linear Algebra: A Modern Introduction, 3rd edition by David Poole (note-custom edition titled Matrix Algebra)

  • Listed under: Linear Algebra, Abstract Algebra

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