☰

使用调整宽度时失去顶部/底部定理间距

tag-icon • tag-icon lists indentation amsthm
使用调整宽度时失去顶部/底部定理间距

为了符合我的数学书中使用的惯例，我希望定理、引理、定义等从左/右边距缩进。用“\begin{adjustwidth}{.6cm}{.6cm}”包裹定理会导致文本之间的顶部/底部间距不同。我可以通过调用 /vspace 来纠正这个问题，但这似乎有点笨拙。有没有更好的格式化方法，还是我只能调用 \vspace？

\documentclass{book}

\usepackage{lipsum}% just to generate text for the example
\usepackage{amsmath, mathtools,amssymb,amscd,amsthm,amstext}
\usepackage{changepage}

% Redefine theorem style
\newtheoremstyle{mytheoremstyle} % name
    {\topsep}                    % Space above
    {\topsep}                    % Space below
    {\itshape}                   % Body font
    {\parindent}                 % Indent amount
    {\bfseries}                  % Theorem head font
    {.}                          % Punctuation after theorem head
    {0.5em}                      % Space after theorem head
    {}                           % Theorem head spec (can be left empty, meaning ‘normal’)
\theoremstyle{mytheoremstyle}
\newtheorem{theorem}{Theorem}[chapter] 

\begin{document}
\lipsum[1-1]
\begin{theorem}
   This theorem looks correct, but I haven't applied any indentation. 
   It follows the indentation of the document.
\end{theorem}
\lipsum[1-1]
\begin{adjustwidth}{.6cm}{.6cm}
\begin{theorem}
   This theorem has had indentation applied and the result is different
   spacing above and below it.
\end{theorem}
\end{adjustwidth}
\lipsum[1-1]
\end{document}

答案1

我可以建议不要使用adjustwidth，但要进行小修改https://tex.stackexchange.com/a/67251/4427

\normalparindent为了避免时间问题（将参数设置为零），这个技巧是\list必要\parindent的。

\documentclass{book}

\usepackage{lipsum}% just to generate text for the example
\usepackage{amsmath, mathtools,amssymb,amscd,amsthm,amstext}
\usepackage{etoolbox}

\makeatletter
\patchcmd{\@thm}
  {\trivlist}
  {\list{}{\leftmargin=\thm@leftmargin\rightmargin=\thm@rightmargin}}
  {}{}
\patchcmd{\@endtheorem}
  {\endtrivlist}
  {\endlist}
  {}{}
\newlength{\thm@leftmargin}
\newlength{\thm@rightmargin}

\newcommand{\xnewtheorem}[3]{%
  \newenvironment{#3}
    {\thm@leftmargin=#1\relax\thm@rightmargin=#2\relax\begin{#3INNER}}
    {\end{#3INNER}}%
  \newtheorem{#3INNER}%
}
\newlength{\normalparindent}
\setlength{\normalparindent}{1sp}
\AtBeginDocument{\setlength{\normalparindent}{\parindent}}
\makeatother

% Redefine theorem style
\newtheoremstyle{mytheoremstyle} % name
    {\topsep}                    % Space above
    {\topsep}                    % Space below
    {\itshape}                   % Body font
    {\normalparindent}           % Indent amount
    {\bfseries}                  % Theorem head font
    {.}                          % Punctuation after theorem head
    {0.5em}                      % Space after theorem head
    {}                           % Theorem head spec (can be left empty, meaning ‘normal’)
\theoremstyle{mytheoremstyle}
\xnewtheorem{.6cm}{.6cm}{theorem}{Theorem}[chapter] 

\begin{document}
\lipsum[1-1]
\begin{theorem}
   This theorem looks correct, but I haven't applied any indentation. 
   It follows the indentation of the document.
\end{theorem}
\lipsum[1-1]
\begin{theorem}
   This theorem has had indentation applied and the result is different
   spacing above and below it.
\end{theorem}
\lipsum[1-1]
\end{document}

在此处输入图片描述

答案2

这是环境的一个普遍问题theorem（重新定义为amsthm) 被用作 . 后面的第一个元素（环境中\item有一个隐藏元素）。这深入探讨了 LaTeX 对列表的管理。\itemadjustwidth

与其修补theorem，我建议在此对 进行破解adjustwidth，这可能足以满足您的文档，但可能会产生我尚未尝试发现的后遗症。 已完成etoolbox，\apptocmd作为商品。

\documentclass{book}

\usepackage{lipsum}% just to generate text for the example
\usepackage{amsmath, mathtools,amssymb,amscd,amsthm,amstext}
\usepackage{changepage}

% Redefine theorem style

\newtheoremstyle{mytheoremstyle} % name
    {\topsep}   % Space above
    {\topsep}   % Space below
    {\itshape}                   % Body font
    {\parindent}                 % Indent amount
    {\bfseries}                  % Theorem head font
    {.}                          % Punctuation after theorem head
    {0.5em}                      % Space after theorem head
    {}                           % Theorem head spec (can be left empty, meaning ‘normal’)

\theoremstyle{mytheoremstyle}
\newtheorem{theorem}{Theorem}[chapter] 

% HACKING \adjustwidth
\usepackage{etoolbox}
\makeatletter
\apptocmd\adjustwidth{\@inlabelfalse\@newlistfalse}
\makeatother

\begin{document}
\lipsum[1-1]
\begin{theorem}
   This theorem looks correct, but I haven't applied any indentation. 
   It follows the indentation of the document.
\end{theorem}
\lipsum[1-1]
\begin{adjustwidth}{.6cm}{.6cm}
\begin{theorem}
   This theorem has had indentation applied and the result is with similar
   spacing above and below it as in previous theorem.
\end{theorem}
\end{adjustwidth}
\lipsum[1-1]
\end{document}

引用

更新

我对这个问题进行了更深入的研究，似乎theorem包中的环境的这个“特性”（错误行为？）可以通过使用但不使用标准（或者更确切地说）amsthm来解释 。宏取代了它，并且缺少常规的某些条件测试：没有部分。amsthm\trivlist\item\@item\deferred@thm@head\@item\if@noparitem \@donoparitem \else ...

原文如下：

\def\deferred@thm@head#1{%
  \if@inlabel \indent \par \fi % eject a section head if one is pending
  \if@nobreak
    \adjust@parskip@nobreak
  \else
    \addpenalty\@beginparpenalty
    \addvspace\@topsep
    \addvspace{-\parskip}%
  \fi
  \global\@inlabeltrue
  \everypar\dth@everypar
  \sbox\@labels{\normalfont#1}%
  \ignorespaces
}

基于 LaTeX 内核模型，重新定义为\@item：

\def\deferred@thm@head#1{%
\if@noparitem
  \@noparitemfalse
\else
  \if@inlabel \indent \par \fi % eject a section head if one is pending
  \if@nobreak
    \adjust@parskip@nobreak
  \else
    \addpenalty\@beginparpenalty
    \addvspace\@topsep
    \addvspace{-\parskip}%
  \fi
  \global\@inlabeltrue
\fi
  \everypar\dth@everypar
  \sbox\@labels{\normalfont#1}%
  \ignorespaces
}

theorem我观察到，如果环境被用作 中的第一个元素，那么使用修补后的宏将不会有额外的空白行\item。修补效果实际上甚至抑制了 由 添加的默认垂直空间theorem，所有垂直空间责任都落在周围列表的肩上（如果有的话）（在 的情况下adjustwidth，这意味着基本上没有额外的垂直空间）。因此，这只是一个提议，但它允许将垂直间距的设置完全委托给周围的列表环境。然后我们可以通过列表环境控制左右边距等……

由于列表中的标准theorem环境中没有出现多余的空行，因此的这一特征似乎是一种错误行为。\itemamsthm

相关内容