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如何获得 1.1 X 的定义

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如何获得 1.1 X 的定义 
\documentclass[12pt]{article}
\usepackage[T1]{fontenc}

\usepackage[left=2.50cm, right=2.54cm, top=2.54cm, bottom=2.54cm]{geometry}

\usepackage{amsthm}

\usepackage{xpatch}%To add . to Def with swapnumber below.
\xpatchcmd\swappedhead{~}{.~}{}{}

%To import frontmatter and mainmatter to the article class
\makeatletter

\newif\if@mainmatter \@mainmattertrue

\newcommand\mainmatter{%
\cleardoublepage
\@mainmattertrue
\pagenumbering{arabic}}
\makeatother

\swapnumbers
 
\newtheorem{Definition}[equation]{{\large \normalfont\rmfamily\scshape Definition}}

\renewcommand{\theequation}{%
\thesection.%
\ifnum\value{subsection}>0 \arabic{subsection}.\fi
\arabic{equation}%
}

\theoremstyle{remark}

\begin{document}

\section{The unwanted parentheses enclosing \guillemotleft of the drift of u\guillemotright}

\begin{Definition}[of the drift of $u$]

\[\textnormal{Here is the defining sentence.}\]

\end{Definition}

\end{document}

答案1

这里我省略了所有细节。您不需要\swapnumbers修补\swappednumbers，因为您修复了定理样式中的格式。

\documentclass{article}
\usepackage{amsthm}

\newtheoremstyle{frode}
  {}
  {}
  {\itshape}
  {}
  {}
  {.}
  {0.5em}
  {\thmnumber{#2. }\thmname{\textsc{#1}}\thmnote{ (#3)}}
\newtheoremstyle{frodenoparentheses}
  {}
  {}
  {\normalfont}
  {}
  {}
  {.}
  {0.5em}
  {\thmnumber{#2. }\thmname{\textsc{#1}}\thmnote{ #3}}

\theoremstyle{frode}
\newtheorem{Theorem}[equation]{Theorem}
\theoremstyle{frodenoparentheses}
\newtheorem{Definition}[equation]{Definition}

\begin{document}

\section{Test}

\begin{Theorem}
This is a theorem.
\end{Theorem}

\begin{Theorem}[Somebody]
This is a theorem with a note.
\end{Theorem}

\begin{Definition}
This is a definition.
\end{Definition}

\begin{Definition}[of the drift of $u$]
This is a definition with a note.
\end{Definition}

\end{document}

在此处输入图片描述

调整以适合您的测试。但是，请不要使用\large。

答案2

使用是amsthm绝对必要的吗？如果不是，您可以简单地从 重新定义定理构建宏latex.ltx。

（我还从 MWE 中删除了许多不必要的东西。）

\documentclass[12pt]{article}
\usepackage[T1]{fontenc}


\makeatletter

\def\@begintheorem#1#2{\trivlist
   \item[\hskip \labelsep{\bfseries #2\ #1}]\itshape}
\def\@opargbegintheorem#1#2#3{\trivlist
      \item[\hskip \labelsep{\bfseries #2\ #1\ #3}]\itshape}

\makeatother

 
\newtheorem{Definition}[equation]{Definition}

\renewcommand{\theequation}{%
\thesection.%
\ifnum\value{subsection}>0 \arabic{subsection}.\fi
\arabic{equation}%
}


\begin{document}

\section{No unwanted parentheses}

\begin{Definition}[of the drift of $u$]

\[\textnormal{Here is the defining sentence.}\]

\end{Definition}

\end{document}

如果您希望使用amsthm，软件包手册第 10 页对此进行了解释。您需要创建一个新的定理样式（以下内容引自该手册）。

\newtheoremstyle{noparens}%
{}{}%
{\itshape}{}%
{\bfseries}{.}%
{ }%
{\thmname{#1}\thmnumber{ #2}\thmnote{ #3}}

并将其用于你的定理；你需要根据你的具体情况适当调整定理头格式的字体命令。

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