Can theorems, lemmas, etc., be automatically displayed without numbers if not referenced (like \mathtoolsset{showonlyrefs}
for equation tags)?
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You might want to refer to a lemma when exposing the contents of the paper; a number can be handy anyway.– egregJan 13, 2014 at 12:41
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That is true. The question remains though.– user66081Jan 13, 2014 at 14:14
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4Damn, where is my please-do-not-do-that tag when I need it?– yo'Jan 29, 2014 at 18:07
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If you know what it looks like, just fake it. In other words, don't use \begin{theorem} etc.– John KormyloJan 29, 2014 at 19:00
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right now I'm using starred environments, but this is not good enough. I'm writing lecture notes, and it is not always clear where to put a star; I think it is helpful to omit numbers as an indication that a particular Example/Lemma/etc has local impact. (It would be even better to have a list of where it is used, if at all).– user66081Jan 29, 2014 at 19:02
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1 Answer
This is certainly not the most elegant solution but it works:
\documentclass{article}
\usepackage{amsthm}
\newcommand{\helpercommand}{}
\newcommand{\thmref}[1]{\label{thm#1}\ref{#1}}
\newtheorem{theorem}{Theorem}
\newtheorem*{theorem*}{Theorem}
\newenvironment{thm}[1]
{
\renewcommand{\helpercommand}{#1}
\ifcsname r@thm#1\endcsname\begin{theorem}\else\begin{theorem*}\fi\label{#1}
}
{
\ifcsname r@thm\helpercommand\endcsname\end{theorem}\else\end{theorem*}\fi
}
\begin{document}
\begin{thm}{labelA}
This theorem is referenced later.
\end{thm}
\begin{thm}{labelB}
This is not.
\end{thm}
\begin{thm}{labelC}
This is again.
\end{thm}
Theorems \thmref{labelA} and \thmref{labelC} are great!
\end{document}
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doesn't this produce multiply defined labels if, say,
\thmref{labelA}
is used multiple times? Feb 3, 2014 at 18:01