Linear Algebra/Matrixes with LaTeX

Matrices $$ \begin{matrix} a &b \\ c &d \end{matrix} $$ $$ \begin{matrix} a &b \\ c &d \end{matrix} $$ $$ \begin{pmatrix} a &b \\ c &d \end{pmatrix} $$ $$ \begin{pmatrix} a &b \\ c &d \end{pmatrix} $$ $$ \begin{bmatrix} a &b \\ c &d \end{bmatrix} $$ $$ \begin{bmatrix} a &b \\ c &d \end{bmatrix} $$ $$ \begin{vmatrix} a &b \\ c &d \end{vmatrix} $$ $$ \begin{vmatrix} a &b \\ c &d \end{vmatrix} $$ $$ \begin{Vmatrix} a &b \\ c &d \end{Vmatrix} $$ $$ \begin{Vmatrix} a &b \\ c &d \end{Vmatrix} $$ go back....