Printing labels along with equation numbers

Question

Working with documents with huge amount of equations it becomes cumbersome to go back and remind yourself what you labeled a certain equation to (I try to name them in a smart way, but there are too many).

Is there a convenient way to have equations print the label along with the tag/number, so that I can easily check the label in the compiled document?

Something like this would be perfect:

x = y               (14.1) eq:my_label

Answer 1

Use the showkeys package (it's compatible with amsmath):

\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\usepackage{showkeys}% http://ctan.org/pkg/showkeys
\begin{document}
\section{A section} \label{sec:label}
It is clear that
\begin{equation}
   a = b \label{eq:my_label}
\end{equation}
so, from~\eqref{eq:my_label} in Section~\ref{sec:label}, we see that\ldots
\end{document}​

It highlights the use of \label, \ref, \pageref, \cite and \bibitem within your document by means of an "overlay" so as to not affect the typesetting of the document.

Answer 2

The refcheck package does something like that. Questionmarks around the label indicate that you haven't referred to that equation yet. (You have to compile twice for this check to work.)

\documentclass{article}
\usepackage{amsmath}
\usepackage{refcheck}
\usepackage{kantlipsum}

\begin{document}
\kant[1]
\begin{equation}\label{eq:1}
a = b
\end{equation}
\kant[2]
\begin{gather}
a = b \label{eq:2}\\
c = d \label{eq:3}
\end{gather}

See \eqref{eq:1}.
\end{document}

Answer 3

showkeys package does exactly this.

Answer 4

Another package providing similar functionality is showlabels

Answer 5

All three packages suggested above:

• showlabels
• showkeys
• refcheck

worked for me. Yet, I had to increase the right margin such that the printed labels are not cut off \usepackage[a4paper,left=1cm,right=4cm,top=1cm,bottom=1cm]{geometry}.