Ref
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Ref is example of numbering of equations and referencing to the equation number.
test \begin{equation} x+1\over\sqrt{1-x^2}\label{ref2} \end{equation}
\begin{equation} \mathrm{e}^{\mathrm i \pi}+1=0 \label{e} \end{equation}
\begin{eqnarray} 123 \label{h} \end{eqnarray}
Do you like equation [\ref{ref2}]?
Do you like equation (\ref{e})?
How about \ref{h}?