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在类定理环境中的交叉引用中包含小节编号

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在类定理环境中的交叉引用中包含小节编号

我认为最好先发布我的代码，然后再问我的问题

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{lipsum}
\usepackage[T1]{fontenc} % optional
\usepackage{thmtools}

\declaretheoremstyle[%
spaceabove=\topsep,
spacebelow=\topsep,
headfont=\small\normalfont,
bodyfont=\itshape\small,
headpunct={.---},
postheadspace=1em,
headformat=\NAME\space\NUMBER,
headindent= 0pt,
]{remark}
\declaretheorem[style=remark,numberwithin=subsection]{remark}
\renewcommand{\theremark}{\arabic{remark}}
\newcommand\rmk[1]{\textit{Remark} \textup{\ref{#1}}}

\makeatletter
\renewcommand*{\p@section}{\S} %Add section symbol to section reference
\renewcommand*{\p@subsection}{\P} %Add section symbol to section reference
\makeatother

\begin{document}

\section{A}
\lipsum[1]

\subsection{A.1}
\label{a}

\begin{remark}
\label{remark}
\lipsum[2]
\end{remark}

\lipsum[2]

\subsection{A.2}

\begin{remark}
\lipsum[2]
\end{remark}

\lipsum[3]

\section{B}
\lipsum[1]
\subsection{B.1}

As we can see in \ref{a}~\rmk{remark}...

\end{document}

正如您在我的代码中看到的，注释枚举（和其他环境枚举）在每个子节处重新启动。我对此非常满意，但问题是，当我想交叉引用另一个子节中的注释时，我必须通过编写 明确指定子节\ref{sec:stuff}。

是否可以修改我的命令\rmk，使其自动包含子节引用？也许可以创建一个新命令来告诉您该环境的当前子节？

答案1

您可以定义\rmk这样一种方式：仅当引用的备注位于另一个小节中时，才打印该小节的编号。

\documentclass[a4paper,12pt]{article}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{thmtools}
\usepackage{xparse}

\usepackage{lipsum}

\declaretheoremstyle[
  spaceabove=\topsep,
  spacebelow=\topsep,
  headfont=\normalfont\itshape\small,
  bodyfont=\normalfont\small,
  headpunct={.\,---\enspace},
  postheadspace=0pt,
  headformat=\NAME\space\NUMBER,
  headindent= 0pt,
]{remark}
\declaretheorem[style=remark,numberwithin=subsection]{remark}
\renewcommand{\theremark}{\arabic{remark}}

\makeatletter
\renewcommand*{\p@section}{\S} %Add section symbol to section reference
\renewcommand*{\p@subsection}{\P} %Add section symbol to section reference
\renewcommand*{\p@remark}{\perhapssubsection{\thesubsection}}
\makeatother

\newcommand{\rmk}[1]{\textit{Remark}~\textup{\ref{#1}}}

\ExplSyntaxOn
\NewDocumentCommand{\perhapssubsection}{m}
 {
  \str_if_eq_x:nnF { #1 } { \thesubsection } { #1. }
 }
\ExplSyntaxOff

\begin{document}

\section{A}
\lipsum[1]

\subsection{A.1}
\label{a}

\begin{remark}
\label{remark}
\lipsum[2]
\end{remark}

\lipsum[2]

\subsection{A.2}

\begin{remark}
\lipsum[2]
\end{remark}

\lipsum[3]

\section{B}
\lipsum[1]
\subsection{B.1}

\begin{remark}\label{remarkhere}
\lipsum[2]
\end{remark}

As we can see in \rmk{remark}
and in \rmk{remarkhere}

\end{document}

我稍微改变了一下注释的外观：我认为注释的头部应该用斜体，但注释主体应该竖直。这不仅是为了与参考文献保持一致，也是为了不让注释太突出：毕竟，你用的是较小的字体排版。欢迎随时恢复。

在此处输入图片描述

答案2

\renewcommand*{\p@remark}{\thesubsection.}大多数情况下，您需要在序言中添加说明。

您可能还想研究如何加载cleveref包（及其\cref宏），以简化和简化一次创建多个交叉引用的过程。请参阅以下屏幕截图的最后一段，了解示例\cref。

在此处输入图片描述

% !TEX TS-program = pdflatex
\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage[T1]{fontenc} % optional
\usepackage{thmtools}

\declaretheoremstyle[%
   spaceabove=\topsep,
   spacebelow=\topsep,
   headfont=\small\normalfont,
   bodyfont=\itshape\small,
   headpunct={.---},
   postheadspace=1em,
   headformat=\NAME\space\NUMBER,
   headindent= 0pt,
  ]{remark}
\declaretheorem[style=remark,numberwithin=subsection]
          {remark}
\renewcommand{\theremark}{\arabic{remark}}
\newcommand\rmk[1]{\textit{Remark}~\textup{\ref{#1}}}

\newcommand\blurb{Nam dui ligula, fringilla a, euismod sodales, 
    sollicitudin vel, wisi. Morbi auctor lorem non justo. Nam 
    lacus libero, pretium at, lobortis vitae, ultricies et, tellus.}

\makeatletter
\renewcommand*{\p@section}{\S}
\renewcommand*{\p@subsection}{\P}
\renewcommand*{\p@remark}{\thesubsection.} % <--- new
\makeatother

\usepackage{cleveref}
\crefname{remark}{\textit{Remark}}{\textit{Remarks}}

\begin{document}

\section{Bla bla bla}
\subsection{Ble ble ble}

\begin{remark} \label{remark_e}
\blurb
\end{remark}

\subsection{Bli bli bli}

\begin{remark} \label{remark_i}
\blurb
\end{remark}

\section{Blo blo blo}
\subsection{Blu blu blu}

As we can see in \rmk{remark_e} as well as in \rmk{remark_i}, \dots

\bigskip\noindent
As we can see in \cref{remark_e,remark_i}, \dots
\end{document}

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