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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
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4 Answers

up vote 18 down vote accepted

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

enter image description here

\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.

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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.)

sample output with refcheck and a couple of equations

\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}
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showkeys package does exactly this.

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Another package providing similar functionality is showlabels

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