Definition:Matrix/Diagonal/Subdiagonal
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Definition
Let $\mathbf A = \sqbrk a_{m n}$ be a matrix.
The subdiagonals of $A$ are the diagonals of $\mathbf A$ lying parallel to and below the main diagonal of $\mathbf A$.
That is, the elements $\map a {r + k, s + k}$ where $s < r$.
Also see
- Results about subdiagonals can be found here.
Sources
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): matrix (plural matrices)
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): subdiagonal