I want to add an appendix section to one chapter in a latex document of class book.
I do not like the style of the subappendices package, where the appendices per chapter are quite highlighted. I like very much the style that the MWE below gives, but I have two problems: I currently manually number the appendix section as 2.A
. The effort is okay with me, but the spacing is not quite right. More importantly, I don't know how to get the Lemma labeled ``2.A.1''.
If I add \renewcommand{\thesection}{2.A}
before the Lemma in the appendix and \renewcommand{\thesection}{\arabic{\section}}
(currently commented out in MWE) then the sections in the following chapter are not numbered within the chapter anymore (3.1 Three.One
becomes 1 Three.One
in the MWE)
\documentclass{book}
\usepackage{amsmath}
\newtheorem{lemma}{Lemma}[section]
\begin{document}
\tableofcontents
\chapter{One}
\section{One.One}
Test One.One
\begin{lemma}
This is numbered as desired.
\end{lemma}
\section{One.Two}
Test One.Two
\chapter{Two}
\section{Two.One}
Test Two.One
\section{One.Two}
Test Two.Two
\section*{2.A Appendix: Pi}
\addcontentsline{toc}{section}{2.A Appendix: Pi}
This section has a little bit too little space between ``2.A'' and ``Appendix: Pi'' (both here and more visibly in the ToC)
%\renewcommand{\thesection}{2.A}
\begin{lemma}
This should be Lemma 2.A.1
\end{lemma}
%\renewcommand{\thesection}{\arabic{section}}
\chapter{Three}
\section{Three.One}
Test Three.One
\begin{lemma}
This should be Lemma 3.1.1
\end{lemma}
\end{document}