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向除第一章之外的所有章节添加“第 N 章”

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向除第一章之外的所有章节添加“第 N 章”

构建于这例如，在每个章节标题中添加了章节，我该如何修改代码来实现这一点除了用于介绍和最后的章节/结论章节（但仍保留编号以用于目录目的）？

\documentclass{tufte-book}
\usepackage{lipsum}

\makeatletter
\titleformat{\chapter}%
  [display]% shape
  {\relax\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\begin{fullwidth}}{}}% format applied to label+text
  {\itshape\huge\chaptertitlename~\thechapter}% label
  {0pt}% horizontal separation between label and title body
  {\huge\rmfamily\itshape}% before the title body
  [\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\end{fullwidth}}{}]% after the title body
\makeatother
\setcounter{secnumdepth}{1}

\begin{document}

\chapter{Introduction}
\lipsum[1]
\chapter{A substantive chapter}
\lipsum[2]
\end{document}

编辑：我对一个灵活的解决方案感兴趣 - 允许我将介绍和结论保持与其他章节相同的编号 - 允许我对介绍和结论不进行编号，但仍然出现在目录中。

答案1

只要在组内进行更改，它们只会影响您想要的章节，您可以灵活地更改其他章节。

\documentclass{tufte-book}
\usepackage{lipsum}

\makeatletter
\newcommand{\mychap}{%
\titleformat{\chapter}%
  [display]% shape
  {\relax\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\begin{fullwidth}}{}}% format applied to label+text
  {\itshape\huge\chaptertitlename~\thechapter}% label
  {0pt}% horizontal separation between label and title body
  {\huge\rmfamily\itshape}% before the title body
  [\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\end{fullwidth}}{}]% after the title body
}
\makeatother
\setcounter{secnumdepth}{1}

\begin{document}

\chapter{Introduction}
\lipsum[1]

\begingroup
\mychap%
\chapter{A substantive chapter}
\lipsum[2]
\chapter{Another chapter}
\lipsum[1]
\endgroup

\chapter{Conclusions}
\lipsum[1]

\end{document}

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