在每个 \newtheorem 之前和之后添加一个 latex 代码

Question

我使用 定义了几个定理amsthm，\newtheorem我想hrule为每个定理添加前缀和后缀。目前我使用

\AddToHook{env/〈env name〉/before}{hrule code}

和

\AddToHook{env/〈env name〉/after}{hrule code}

对每一个\newtheorem。

有什么想法可以让我的代码更紧凑，以便我AddToHook只声明一次 s，而不是每次定义新note样式环境时都声明它？

\documentclass{book}
\usepackage{amsthm}
\newtheoremstyle{note}% 〈name〉
{3pt}% 〈Space above〉
{3pt}% 〈Space below 〉
{}% 〈Body font〉
{}% 〈Indent amount〉
{\itshape}% 〈Theorem head font〉
{:}% 〈Punctuation after theorem head 〉
{.5em}% 〈Space after theorem head 〉3
{}% 〈Theorem head spec (can be left empty, meaning ‘normal’ )

\theoremstyle{note}
\newtheorem{theorem}{Theorem}
  \AddToHook{env/theorem/before}{\par\vspace{\baselineskip}\hrule}
  \AddToHook{env/theorem/after}{\hrule\vspace{\baselineskip}}

\newtheorem{definition}{Definition}[chapter]
  \AddToHook{env/definition/before}{\vspace{\baselineskip}\par\hrule} % same Hook as above
  \AddToHook{env/definition/after}{\hrule\vspace{\baselineskip}}

\newtheorem{remark}{Remark}[chapter]
  \AddToHook{env/remark/before}{\vspace{\baselineskip}\par\hrule} % Those two hooks again
  \AddToHook{env/remark/after}{\hrule\vspace{\baselineskip}}
\begin{document}
Some theorems, definitions and remarks appear here.
\end{document}

我知道thmtools及其preheadhook和postfoothook键。但我只想使用amsthm。

Answer 1

您可以使用合适的宏轻松实现该效果。

\newcommand*\newtushtheorem[1]{%
  \AddToHook{env/#1/before}{\par\vspace{\baselineskip}\hrule}%
  \AddToHook{env/#1/after}{\hrule\vspace{\baselineskip}}%
  \newtheorem{#1}%
}

\newtushtheorem{theorem}{Theorem}
\newtushtheorem{definition}{Definition}[chapter]
\newtushtheorem{remark}{Remark}[chapter]

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然而，正如评论请注意，这种添加规则的方式可能并不总是按照首选方式运行。