Category:Main Diagonal
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This category contains results about Main Diagonal.
Definitions specific to this category can be found in Definitions/Main Diagonal.
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 main diagonal of $\mathbf A$.
That is, the main diagonal of $\mathbf A$ is the diagonal of $\mathbf A$ from the top left corner, that is, the element $a_{1 1}$, running towards the lower right corner.