If $L$ is a lower triangular matrix of ones, does the following matrix have a special name?
$$A = \left(\begin{matrix}L & -L \\ -L & L \end{matrix}\right)$$
If $L$ is a lower triangular matrix of ones, does the following matrix have a special name?
$$A = \left(\begin{matrix}L & -L \\ -L & L \end{matrix}\right)$$