In linear algebra, the **trace** of a square matrix is defined as the sum of its diagonal elements. If \( A \) is an \( n \times n \) matrix, the trace is mathematically expressed as: \[ \text{Trace}(A) = \sum_{i=1}^{n} A_{ii} \] where \( A_{ii} \) denotes the elements on the main diagonal of the matrix \( A \).

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