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Simple Equations

$$\begin{equation} \label{eq1}
e=mc^2
\end{equation}$$

Multi-line Equations

$$\begin{equation} \label{eq2}
\begin{aligned}
a &= b + c \
&= d + e + f + g \
&= h + i
\end{aligned}
\end{equation}$$

Multiple Aligned Equations

$$\begin{align}
a &= b + c \label{eq3} \
x &= yz \label{eq4} \
l &= m - n \label{eq5}
\end{align}$$

Exclude Equations from Numbering

$$\begin{align}
-4 + 5x &= 2 + y \nonumber \
w + 2 &= -1 + w \
ab &= cb
\end{align}$$

Use \tag to Tag Equations

$$x+1\over\sqrt{1-x^2} \tag{i}\label{eq_tag}$$