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定理计数器不增加

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定理计数器不增加

这是我的代码

\documentclass{book}
\usepackage[utf8]{inputenc}

\usepackage{natbib}
\usepackage{graphicx}
\usepackage{enumerate}
\usepackage{parskip}
\usepackage{emptypage}
\usepackage{multirow}
\usepackage{framed}
\usepackage{bm}
\usepackage{hhline}

\usepackage{mathtools}
\usepackage{amsthm, amsmath}

\newtheoremstyle{definition}
  {\parskip}%                             % Space above
  {\parskip}%                             % Space below
  {\itshape}%                             % Body font
  {}%                                     % Indent amount
  {\bfseries}%                            % Theorem head font
  {~---}%                                 % Punctuation after theorem head
  { }%                                    % Space after theorem head
  {}
\theoremstyle{definition}

\usepackage[left=1in, right=1in, top=1.5in, bottom=1.5in]{geometry}

\usepackage{hyperref}
\hypersetup{
    linktoc=all     %set to all if you want both sections and subsections linked
}


\begin{document}

\frontmatter

\tableofcontents

\mainmatter

\chapter{Some Chapter}

\section{Some Section}

\newtheorem{somedef}{Definition}
\begin{somedef}
Some definition
\end{somedef}

\newtheorem{somedef2}{Definition}
\begin{somedef2}
Some other definition
\end{somedef2}

\end{document}

我正在 Overleaf 上编译此内容（不确定是否重要），链接在这里：https://www.overleaf.com/read/tsbqtfwbgsvm

定理计数器怎么没有增加？两个定义都显示 1。

感谢任何帮助。

编辑：我希望定理从 1 开始并以 1 为增量递增。这难道不应该是默认行为吗？

答案1

因此，您实际上正在寻找的是：

\documentclass{book}
\usepackage[utf8]{inputenc}

\usepackage{natbib}
\usepackage{graphicx}
\usepackage{enumerate}
\usepackage{parskip}
\usepackage{emptypage}
\usepackage{multirow}
\usepackage{framed}
\usepackage{bm}
\usepackage{hhline}

\usepackage{mathtools}
\usepackage{amsthm, amsmath}

\newtheoremstyle{definition}
  {\parskip}%                             % Space above
  {\parskip}%                             % Space below
  {\itshape}%                             % Body font
  {}%                                     % Indent amount
  {\bfseries}%                            % Theorem head font
  {~---}%                                 % Punctuation after theorem head
  { }%                                    % Space after theorem head
  {}
\theoremstyle{definition}

\usepackage[left=1in, right=1in, top=1.5in, bottom=1.5in]{geometry}

\usepackage{hyperref}
\hypersetup{
    linktoc=all     %set to all if you want both sections and subsections linked
}


\begin{document}

\frontmatter

\tableofcontents

\mainmatter

\chapter{Some Chapter}

\section{Some Section}

\newtheorem{somedef}{Definition}
\begin{somedef}
Some definition
\end{somedef}

% Do NOT issue a second \newtheorem{somedef2}{Definition}
% Simply reuse the same environment as above:
\begin{somedef}
Some other definition
\end{somedef}

\end{document}

还是我又误解了？

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