MathJax environment
inline \(x\)
equation
\[\begin{equation}
x\label{eq:0}
\end{equation}\]
align
\[\begin{align}
&ax+b
\label{eq:1}
\\
&cx+d
\label{eq:2}
\end{align}\]
The equations \eqref{eq:0}, \eqref{eq:1} and \eqref{eq:2}.
\[\begin{equation}
A=\begin{bmatrix}
a&b\\
c&d
\end{bmatrix}
\, .
\end{equation}\]