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Suppose I have some theorem in the paper

Section 1

Theorem 1.1. Let ...

And then later in the paper I want to recall the theorem by reprinting it

Section 4

We recall Theorem 1.1:

Theorem 1.1. Let ...

What's the proper way to do this?

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Welcome to TeX.SE. I would just store the contents of the theorem in a macro and re-use the macro for the initial and reuse. –  Peter Grill Apr 9 '12 at 15:05
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Interesting question! However, I have serious doubts whether this is actually a good idea. A traditional \reference might actually be better. As a reader, if I saw Theorem 1.1 in two places of a book, I'd think it's a mistake, and after seeing that this is actually the same theorem, I might feel "cheated" by the author... –  mbork Apr 9 '12 at 15:29
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2 Answers

up vote 23 down vote accepted

The thm-restate package which is part of thmtools offers a restatable environment. In the following example, I also use hyperref and cleveref (its \cref macro automatically adds the correct theorem type). See section 1.4 of the thmtools manual for details.

\documentclass{article}

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

\usepackage{hyperref}

\usepackage{cleveref}

\declaretheorem[name=Theorem,numberwithin=section]{thm}

\begin{document}

\section{First}

\begin{restatable}[Goldbach's conjecture]{thm}{goldbach}
\label{thm:goldbach}
Every even integer greater than 2 can be expressed as the sum of two primes.
\end{restatable}

\section{Second}

We recall \cref{thm:goldbach}:

\goldbach*

\end{document}

enter image description here

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I can't comment yet, so hopefully this will change to one. I got lots of errors when I tried to use thm-restate just now. The problem seemed to be that it didn't like being in the same \usepackage command as other packages. It also likes to be placed after amsthm. –  Jessica B Oct 14 '13 at 16:49
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If you need it only once or twice or so, you can locally in the repeating: 1) tweak theorem label printing, 2) add -1 to the theorem counter since it gets increased by the repeated theorem. The code:

\documentclass{article}
\usepackage{amsthm}
\newtheorem{theorem}{Theorem}[section]
\begin{document}

\section{First}

\begin{theorem}\label{mythm}
Let $x$ ...
\end{theorem}

\section{Second}

\begin{theorem}
This should be two.one
\end{theorem}

Let us recall the theorem from the first section.

\begingroup
\def\thetheorem{\ref{mythm}}
\begin{theorem}
Let $x$ ...
\end{theorem}
\addtocounter{theorem}{-1}
\endgroup

\begin{theorem}
This should be two.two
\end{theorem}

\end{document}
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