amsbooknumberingtheorems
I want theorems to be labeled of the form Part.Chapter.Section.number so I tried
\renewcommand{\thesection}{\Roman{part}.\thechapter.\arabic{section}}
\newtheorem{book}{Theorem}[section]
\newtheorem{AddProp}[book]{Additive Property of Equality}
\begin{AddProp} Testing \end{AddProp}
But does what I want, but as a side effect it also changes the sections, is there a way to only change the theorem numbering?
There are a couple of problems here:
\chapter instead of \part and a lot of your problems with disappear. \part with the base LaTeX article class. If you want to stick with the base LaTeX document classes, use report rather than article if the document truly does contain parts. You can use the report class for a document that does not contain parts (highest entity is a \chapter).Similar to the solution at this question and section 3 of the amsthm documentation:
\documentclass[11pt,a4paper]{report}
\usepackage{amsthm}
\theoremstyle{plain}
\newtheorem{thm}{Theorem}[chapter] % reset theorem numbering for each chapter
\theoremstyle{definition}
\newtheorem{defn}[thm]{Definition} % definition numbers are dependent on theorem numbers
\newtheorem{exmp}[thm]{Example} % same for example numbers
\newcommand{\chaptercontent}{
\section{Basics}
\begin{defn}Here is a new definition.\end{defn}
\begin{thm}Here is a new theorem.\end{thm}
\begin{thm}Here is a new theorem.\end{thm}
\begin{exmp}Here is a good example.\end{exmp}
\subsection{Some tips}
\begin{defn}Here is a new definition.\end{defn}
\section{Advanced stuff}
\begin{defn}Here is a new definition.\end{defn}
\subsection{Warnings}
\begin{defn}Here is a new definition.\end{defn}
}
\begin{document}
\tableofcontents
\part{Addition and Subtraction}
\chapter{Addition} \chaptercontent
\chapter{Subtraction} \chaptercontent
\part{Multiplication and Division}
\chapter{Multiplication} \chaptercontent
\chapter{Division} \chaptercontent
\end{document}
Best Answer
To have your
AddProp"theorem" numbered by section using Part.Chapter.Section.Number, you can use:This will also reset your
bookcounter after every new\section. Here's a minimal example showing the usage/output:If you wish to maintain this structure, but have the
bookcounter only reset every\chapter, then you need to drop the[section]part from the definition of thebooktheorem, and add the counter reset to yourbookcounter manually:This functionality is provided by the
chngcntrpackage as well asamsmathvia user-friendly macros. Since you're usingamsbook, you could use\numberwithin{book}{chapter}. See Master and slave counters and perhaps Section numbering with chapter inamsbook.