(m 1,1m 1,2m 1,n m 2,1m 2,2m 2,n m n,1m n,2m n,n) \begin{pmatrix} m_{1,1} m_{1,2} \cdots m_{1,n} \\ m_{2,1} m_{2,2} \cdots m_{2,n} \\ \vdots \vdots \ddots \vdots \\ m_{n,1} m_{n,2} \cdots m_{n,n} \end{pmatrix}