我希望章節編號為numberchapter.numbersection.所以我輸入
\renewcommand{\thesection}{\arabic{chapter}.\arabic{section}.}
但如果我想做一個定理，定理編號就會顯示Theorem numberchapter.numbersection..numbertheorem。numbersection和之間有一個雙點numbertheorem。我怎麼能讓它只顯示一個點？
\documentclass[twoside,11pt]{book}
\usepackage[left=2.5cm,right=2cm,top=2cm,bottom=2cm,papersize={15.5cm,23.5cm}]{geometry}
\renewcommand{\thechapter}{\Roman{chapter}}
\renewcommand{\thesection}{\arabic{chapter}.\arabic{section}.}
\renewcommand{\thesubsection}{\arabic{chapter}.\arabic{section}.\arabic{subsection}.}
\usepackage{amsthm}
\newtheorem{definition}{Definition}[section]
\newtheorem{theorem}{Theorem}[section]
\begin{document}
\chapter{ABC}
blablabla
\section{ONE}
\begin{theorem}
dddd
\end{theorem}
\end{document}
編輯：
根據 Egreg 的回答，如果我格式化該部分和小節，則不會出現點。為什麼會發生這種情況以及解決方案是什麼？
\documentclass{book}
\usepackage{amsthm,titlesec}
\titleformat{\section}
[hang]
{\bfseries}
{\bfseries\thesection}{1ex}{\bfseries}
\titlespacing{\section}{1.5pt}{0.2cm}{0.2cm}
\titleformat{\subsection}
[hang]
{\bfseries}
{\bfseries\thesubsection}{1ex}{\bfseries}
\titlespacing{\subsection}{1.5pt}{0.2cm}{0.2cm}
\renewcommand{\thechapter}{\Roman{chapter}}
\makeatletter
\renewcommand{\@seccntformat}[1]{%
\ifcsname format#1\endcsname
\csname format#1\endcsname
\else
\csname the#1\endcsname
\fi
\quad
}
\makeatother
\newcommand{\formatsection}{\thesection.}
\newcommand{\formatsubsection}{\thesubsection.}
\renewcommand{\thesection}{\arabic{chapter}.\arabic{section}}
\newtheorem{definition}{Definition}[section]
\newtheorem{theorem}{Theorem}[section]
\begin{document}
\chapter{ABC}
blablabla with \ref{sec:one} and no period.
\section{ONE}\label{sec:one}
\begin{theorem}
dddd
\end{theorem}
\subsection{TWO}
Just to see what happens.
\end{document}
答案1
您很可能不希望對節和小節的交叉引用具有尾隨句點。所以你不想硬連線 in\thesection和 in 中的句點\thesubsection。
使用以下程式碼，尾隨句點由 來新增\@seccntformat。
\documentclass{book}
\usepackage{amsthm}
\renewcommand{\thechapter}{\Roman{chapter}}
\makeatletter
\renewcommand{\@seccntformat}[1]{%
\ifcsname format#1\endcsname
\csname format#1\endcsname
\else
\csname the#1\endcsname
\fi
\quad
}
\makeatother
\newcommand{\formatsection}{\thesection.}
\newcommand{\formatsubsection}{\thesubsection.}
\renewcommand{\thesection}{\arabic{chapter}.\arabic{section}}
\newtheorem{definition}{Definition}[section]
\newtheorem{theorem}{Theorem}[section]
\begin{document}
\chapter{ABC}
blablabla with \ref{sec:one} and no period.
\section{ONE}\label{sec:one}
\begin{theorem}
dddd
\end{theorem}
\subsection{TWO}
Just to see what happens.
\end{document}
如果您使用titlesec它會更容易，因為您可以在正確的位置明確添加句點。
\documentclass{book}
\usepackage{amsthm,titlesec}
\titleformat{\section}[hang]
{\bfseries}
{\thesection.}
{1ex}
{}
\titlespacing{\section}{1.5pt}{0.2cm}{0.2cm}
\titleformat{\subsection}[hang]
{\bfseries}
{\thesubsection.}
{1ex}
{}
\titlespacing{\subsection}{1.5pt}{0.2cm}{0.2cm}
\renewcommand{\thechapter}{\Roman{chapter}}
\renewcommand{\thesection}{\arabic{chapter}.\arabic{section}}
\newtheorem{definition}{Definition}[section]
\newtheorem{theorem}{Theorem}[section]
\begin{document}
\chapter{ABC}
blablabla with \ref{sec:one} and no period.
\section{ONE}\label{sec:one}
\begin{theorem}
dddd
\end{theorem}
\subsection{TWO}
Just to see what happens.
\end{document}
答案2
嘗試：
\renewcommand{\thetheorem}{\thesection\arabic{theorem}}