按书章将定理计数器重新设置为 1

Question

我正在使用和\documentclass{book}包。每章都是一篇独立的论文，所以我希望每章中的定理都从 1 开始。我该怎么做？amsmathamsthm

这是 MWE。

\documentclass[printer]{book}
\usepackage{amsmath}
\usepackage{amsthm}
\newtheorem{theorem}{Theorem}

\begin{document}
\chapter{Blahblah}
\begin{theorem}{This is Theorem 1 as it should be}
\end{theorem}

\begin{theorem}{This is Theorem 2 as should be}
\end{theorem}

\chapter{Blibli}

\begin{theorem}{I need this to be Theorem 1!}
\end{theorem}

\end{document}

Answer 1

如果不想\setcounter{theorem}{0}每次都手动写，可以这样做：

\documentclass{book} 
\usepackage{amsmath} 
\usepackage{amsthm} 
\newtheorem{theorem}{Theorem}[chapter]
\renewcommand{\thetheorem}{\arabic{theorem}}

\begin{document} 
\chapter{Blahblah} 
\begin{theorem}
This is Theorem 1 as it should be
\end{theorem}
\begin{theorem}
This is Theorem 2 as should be
\end{theorem}

\chapter{Blibli}
\begin{theorem}
I need this to be Theorem 1! 
\end{theorem}
\end{document}

Answer 2

这可以实现您对该包的使用要求chngcntr。请再次阅读包手册。

% thmcntrprob.tex  SE 646889

\documentclass[printer]{book}
\usepackage{amsmath}
\usepackage{amsthm}
\newtheorem{theorem}{Theorem}

\usepackage{chngcntr}
\counterwithin*{theorem}{chapter}

\begin{document}
\chapter{Blahblah}
\begin{theorem}{This is Theorem 1 as it should be} \end{theorem}

\begin{theorem}{This is Theorem 2 as should be} \end{theorem}

\chapter{Blibli}

\begin{theorem}{I need this to be Theorem 1!} \end{theorem}

\end{document}