0

I'm writing some notes, and I'd like to have a different labeling convention in the appendices than in the main text. In the main text I'd like to label things with 2 tiers (e.g., Theorem 3.2) while in the appendix I'd like to label them with 3 tiers (e.g., Theorem A.1.5). Is this possible?

Aaron Landesman
  • 103
  • 1
    Welcome to TeX.SE! Please have a look here, i.e. try \numberwithin. If this fails, you may want to provide more context, e.g. an MWE. –  May 13 '18 at 02:13

1 Answers1

2

The answer is yes, see e.g. here.

\documentclass{article}
\usepackage{amsmath,amsthm}
\newtheorem{mythm}{Theorem}[section] 

\begin{document}
\section{Eucalyptus trees}
\begin{mythm}
   Koalas love eucalyptus. 
\end{mythm}

\section{Marmots}
\begin{mythm}
   Koalas like marmots. 
\end{mythm}

\numberwithin{mythm}{subsection}
\appendix
\section{Activities}
\subsection{During daytime}
\begin{mythm}
   Koalas sleep a lot. 
\end{mythm}
\subsection{Hibernation}
\begin{mythm}
   Koalas don't hibernate. 
\end{mythm}
\end{document}
  • Thanks, this is super helpful! As a quick followup, if I want to change the numbering for both Lemmas and Theorems (and other theorem environments), do I have to add lines \numberwithin{theorem}{subsection} and \numberwithin{lemma}{subsection} or is it possible to change the numberings for all environments with one command? – Aaron Landesman May 13 '18 at 16:22
  • @AaronLandesman No, you can make counters follow a master counter, see here and perhaps also here. –  May 13 '18 at 17:23