Definition:Diagonal of Array/Main Antidiagonal
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Definition
Let $\mathbf A = \sqbrk a_{m n}$ be an array.
The main antidiagonal of $\mathbf A$ is the antidiagonal of $\mathbf A$ from the top right corner, that is, the element $a_{1 n}$, running towards the lower left corner.
Also known as
The main antidiagonal of a matrix is also known as its secondary diagonal.
Also see
- Results about the main antidiagonal can be found here.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): diagonal: 3.
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): diagonal: 3.