Definition:Matrix/Diagonal Elements

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Let $\mathbf A = \sqbrk a_{m n}$ be a matrix.

The elements $a_{j j}: j \in \closedint 1 {\min \set {m, n} }$ constitute the principal diagonal or main diagonal of the matrix, and the elements themselves are called the diagonal elements.

Also defined as

Some sources define the diagonal elements only for a square matrix.

Also known as

Some sources refer to diagonal entries.

Also see