\[\mathbf{A}=[a_{ij}]=\left[\begin{matrix}a_{11}&a_{12}&\dots&a_{1n}\\
a_{21}&a_{22}&\dots&a_{2n}\\
\vdots&\vdots&\ddots&\vdots\\
a_{m1}&a_{m2}&\dots&a_{mn}\end{matrix}\right],\]