Using eqref with multiple equations

[cesar....@gmail.com]

If I have the following equations:

\begin{align} \label{ref1}
a = b\\
c = d\\
e = f\\
g = h\\
i = j
\end{align}

all equations are automatically numbered, since I have

<script type="text/x-mathjax-config">
MathJax.Hub.Config({
  TeX: {
    equationNumbers: {autoNumber: "all"}
  }
});
</script>

How can I access the 2. or the 3. equation with \eqref{} or \ref{}?

Many thanks in advance,

--
Cesar

[Davide P. Cervone]

Put the \label{} on the line that you want to refer to.  E.g.,

\begin{align} 

a = b\\

c = d\\

e = f\label{eq1-line3}\\

g = h\\

i = j

\end{align}

would make \ref{eq1-line3} refer to the equation number for the third line in the alignment.  Since the \label{ref1} in your example is on the first line, it refers to the equation number for the first line.

Davide

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[Cesar Romani]

On 22/01/2015 07:16 p.m., Davide P. Cervone wrote:
> Put the \label{} on the line that you want to refer to. E.g.,
>
> \begin{align}
> a = b\\
> c = d\\
> e = f\label{eq1-line3}\\
> g = h\\
> i = j
> \end{align}
>
> would make \ref{eq1-line3} refer to the equation number for the third
> line in the alignment. Since the \label{ref1} in your example is on
> the first line, it refers to the equation number for the first line.
>
> Davide

Thanks. I already know what was the reason I didn't get any display when
I put labels on the equations. I was putting labels in the following
way:

\begin{align}
a = b\\

c = d\\ \label{eq1-line2}

e = f\\ \label{eq1-line3}
g = h\\
i = j
\end{align}

then I didn't get any display with it. I had to put the \\ after the
labels!

Regards,

--
Cesar