\begin{CD}
A @>a>> B \\
@VbVV @AAcA \\
C @= D
\end{CD}
\begin{CD}
A @>a>> B \\
@VbVV @AAcA \\
C @= D
\end{CD}
\begin{CD}
A @>a>> B \\
@VbVV @AAcA \\
C @= D
\end{CD}
\begin{CD}
A @>a>> B \\
@VbVV @AAcA \\
C @= D
\end{CD}
\begin{alignat}{2}
10&x+&3&y=2\\
3&x+&13&y=4
\end{alignat}
\begin{alignat}{2}
10&x+&3&y=2\\
3&x+&13&y=4
\end{alignat}
\begin{gather}
a=b \\
e=b+c
\end{gather}
\begin{gather}
a=b \\
e=b+c
\end{gather}
\begin{align}
a&=b+c \\
d+e&=f
\end{align}
\begin{align}
a&=b+c \\
d+e&=f
\end{align}
\begin{equation}
\begin{split} a &=b+c\\
&=e+f
\end{split}
\end{equation}
\begin{equation}
\begin{split} a &=b+c\\
&=e+f
\end{split}
\end{equation}
\sum_{
\begin{subarray}{l}
i\in\Lambda\\
0<j<n
\end{subarray}}
\sum\_{
\begin{subarray}{l}
i\in\Lambda\\
0<j<n
\end{subarray}}
\begin{smallmatrix}
a & b \\
c & d
\end{smallmatrix}
\begin{smallmatrix}
a & b \\
c & d
\end{smallmatrix}
\begin{rcases}
a &\text{if } b \\
c &\text{if } d
\end{rcases}ââ¦
\begin{rcases}
a &\text{if } b \\
c &\text{if } d
\end{rcases}ââ¦
x = \begin{cases}
a &\text{if } b \\
c &\text{if } d
\end{cases}
x = \begin{cases}
a &\text{if } b \\
c &\text{if } d
\end{cases}
\def\arraystretch{1.5}
\begin{array}{c:c:c}
a & b & c \\ \hline
d & e & f \\
\hdashline
g & h & i
\end{array}
\def\arraystretch{1.5}
\begin{array}{c:c:c}
a & b & c \\ \hline
d & e & f \\
\hdashline
g & h & i
\end{array}
\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}
\begin{bmatrix}
a & b \\
c & d
\end{bmatrix}
\begin{bmatrix}
a & b \\
c & d
\end{bmatrix}
\begin{pmatrix}
a & b \\
c & d
\end{pmatrix}
\begin{pmatrix}
a & b \\
c & d
\end{pmatrix}
\begin{array}{cc}
a & b \\
c & d
\end{array}
\begin{array}{cc}
a & b \\
c & d
\end{array}
\begin{matrix}
a & b \\
c & d
\end{matrix}
\begin{matrix}
a & b \\
c & d
\end{matrix}