\begin{matrix} a & b \\ c & d \end{matrix} |
acbd |
\begin{pmatrix} a & b \\ c & d \\ \end{pmatrix} |
(acbd) |
\begin{bmatrix} a & b \\ c & d \\ \end{bmatrix} |
[acbd] |
f(x) = \begin{cases} a, & {x \; is \; even} \\ b, & {x \; is \;odd} \end{cases} |
f(x)={a,b,xisevenxisodd |
\begin{Bmatrix} a,b,c,d,e \end{Bmatrix} |
{a,b,c,d,e} |