I am trying to reset a counter to zero; however `hyperref`

tries to reference previous equations. I am using:

```
\setcounter{equation}{0}
```

And if I have labels in say `align`

environments:

```
\documentclass{article}
\usepackage{amsmath}
\usepackage{hyperref}
\begin{document}
\begin{align}
x=1
\label{eq:a} \\
y=2
\label{eq:b}
\end{align}
Eq.~\eqref{eq:a}.
Reset counter
\newpage
\setcounter{equation}{0}
\begin{align}
x=10
\label{eq:c} \\
y=20
\label{eq:d}
\end{align}
Now trying to refer to third equation Eq.~\eqref{eq:c}
\end{document}
```

If I now `\ref{eq:c}`

, the `hyperref`

package will point me back to `eq:a`

(in text, they both have the same number).

Is there a way to fix this without manually stepping a new counter you make? I.e. can you fix it without doing something like this:

```
\documentclass{article}
\usepackage{amsmath}
\usepackage{hyperref}
\begin{document}
\begin{align}
x=1
\label{eq:a} \\
y=2
\label{eq:b}
\end{align}
Eq.~\eqref{eq:a}.
Reset counter
\newpage
%% \setcounter{equation}{0} %Commented out line
\newcounter{newequation} %Added line
\renewcommand{\theequation}{\arabic{newequation}} %Added line
\stepcounter{newequation} %Added line
\begin{align}
x=10
\label{eq:c} \\
\stepcounter{newequation} %Added line
y=20
\label{eq:d}
\end{align}
Now trying to refer to third equation Eq.~\eqref{eq:c}
\end{document}
```

?

## Best Answer

To produce correct references, you have to make the counter values unique to

`hyperref`

. To do so, you can introduce a parent counter`myequation`

: Each time this counter is increased, the counter`equation`

is reset. Like this,`hyperref`

can take into account both the value of`myequation`

and`equation`

to produce the correct hyperlink.In order to do this, add the following code to your document after having loaded

`hyperref`

:Resetting the equation counter is done by stepping

`myequation`

, so use`\stepcounter{myequation}`

instead of`\setcounter{equation}{0}`

.## Full example code: