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This question already has an answer here:

I have some lemma (let's call it lemma 4) in my main text, but I prove it in the appendix. Therefore, I want to restate the lemma in the appendix again as lemma 4. How can I achieve this?

Thanks!

marked as duplicate by CarLaTeX, Raaja, Stefan Pinnow, TeXnician, Tiuri Apr 26 at 12:09

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    Could you add a minimal example code? – user156344 Apr 26 at 8:07
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You can use the thm-restate package of thmtools:

\documentclass{article}

\usepackage{thmtools}
\usepackage{thm-restate}

\declaretheorem{Lemma}

\begin{document}

\section{First}    
\begin{restatable}{Lemma}{lemmfour}
    \label{lemm:4}
    Content of Lemma~4.
\end{restatable}


\section{Second}
\lemmfour*

\end{document}
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One way would be to use the thm-restate package which is part of thmtools. See for example the answer to this question.

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    Could you please add an example code, which solves the issue stated in the question, to make your answer clearer? – user156344 Apr 26 at 8:19

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