5

This question already has an answer here:

Somewhere in my document I have some equation:

\begin{equation}
    \label{some_equation}
    ...
\end{equation}

I would like to repeat this equation later (so that the reader does not have to flip back and forth between sections), but would like it to appear with the same label (e.g. if it was numbered as equation (1), I would like its "clone" to also appear with the numbering (1)). Is there an easy way to do this?

marked as duplicate by user13907, Maarten Dhondt, Symbol 1, Werner cross-referencing Dec 29 '15 at 9:59

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

8

You could use \tag together with a \label and \ref combo as in the following MWE

\documentclass{article}
\usepackage{amsmath,amssymb}
\usepackage{lipsum}
\pagestyle{empty}
\begin{document}

\begin{equation}
  y = x^2 +3 \label{eqn:1}
\end{equation}

\lipsum[1]

\begin{equation}
  y = x^2 +3 \tag{\ref{eqn:1}}
\end{equation}

\end{document}
  • 2
    Please, don't use align for one line displays. Ever. – egreg Jul 20 '13 at 19:52

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