[tex]A\:square\:matr\imaginaryI x[/tex]
1) Whenever we face a matrix whose number of rows (m) is equal to the number of columns (n) like:
[tex]A=\begin{bmatrix}{1} & {2} & {3} \\ {4} & {5} & {6} \\ {7} & {8} & {9}\end{bmatrix}_{3\times3}[/tex]
2) We can call them:
[tex]A\:square\:matrix[/tex]
