Anti-diagonal matrix
= Anti-diagonal matrix
{wiki=Anti-diagonal_matrix}
An anti-diagonal matrix (also known as a skew-diagonal matrix) is a type of square matrix where the entries are non-zero only on the anti-diagonal, which runs from the top right corner to the bottom left corner of the matrix. In other words, for an \\( n \\times n \\) matrix \\( A \\), the entry \\( a_\{ij\} \\) is non-zero if and only if \\( i + j = n + 1 \\).