新定理风格

Question

我对 LaTeX 还很陌生。我不太理解下面的代码，它只是从维基百科粘贴的模板。

我正在尝试制作一种简单的定理样式，它与普通的定理样式相同，但数字后面有一个破折号。我试过了，但一直出现编号错误。在我打字的时候，它停了一会儿。无论如何，告诉它做定理样式的最佳方法是什么？我觉得可能有一个非常简单的方法。

\newtheoremstyle{theoremdd}% name of the style to be used
{}% measure of space to leave above the theorem. E.g.: 3pt
{}% measure of space to leave below the theorem. E.g.: 3pt
{}% name of font to use in the body of the theorem
{}% measure of space to indent
{}% name of head font
{}% punctuation between head and body
{ }% space after theorem head; " " = normal interword space
{\thmname{#1}\thmnumber{ #2'}\thmnote{ (#3)}.}

\theoremstyle{theoremdd}
\newtheorem{thmd}{Theorem}[section]

...

\begin{thmd}[hello]
 jfgh
\end{thmd}

虽然理解所有代码的含义很好，但我迫切需要一个修复。

谢谢，理查德

编辑/更新：

除了完全不理解 LaTeX 代码的工作原理外，我还有一个可以运行的产品，但这完全是一种变通方法。如果我错了，请纠正我，但 #2 代表一个数字。我只想从计数器中减去 1。目前这是我的修复方法：

 \newtheoremstyle{theoremd}% name of the style to be used
  {}% measure of space to leave above the theorem. E.g.: 3pt
  {}% measure of space to leave below the theorem. E.g.: 3pt
  {\em}% name of font to use in the body of the theorem
  {}% measure of space to indent
  {\bf}% name of head font
  {.}% punctuation between head and body
  { }% space after theorem head; " " = normal interword space
  {\thmname{#1}\thmnumber{\addtocounter{thm}{-1} #2}'\thmnote{\textnormal{ (#3)}}}

正如你所见，我一无所知。如果能得到更多的理解，我将不胜感激。

最新编辑：

这就是我所决定的。欢迎大家提出意见。我仍然不确定这一切是如何运作的，但感谢大家，我学到了很多东西。

\newtheoremstyle{theoremd}% name of the style to be used
{}% measure of space to leave above the theorem. E.g.: 3pt
{}% measure of space to leave below the theorem. E.g.: 3pt
{\em}% name of font to use in the body of the theorem
{}% measure of space to indent
{\bf}% name of head font
{.}% punctuation between head and body
{ }% space after theorem head; " " = normal interword space
{\thmname{#1}\thmnumber{\addtocounter{thm}{-1} #2$^\prime$}\thmnote{\textnormal{ (#3)}}}

Answer 1

只需填写必要的参数即可。

\documentclass{article}
\usepackage{amsthm}

\newtheoremstyle{theoremdd}% name of the style to be used
  {\topsep}% measure of space to leave above the theorem. E.g.: 3pt
  {\topsep}% measure of space to leave below the theorem. E.g.: 3pt
  {\itshape}% name of font to use in the body of the theorem
  {0pt}% measure of space to indent
  {\bfseries}% name of head font
  {. ---}% punctuation between head and body
  { }% space after theorem head; " " = normal interword space
  {\thmname{#1}\thmnumber{ #2}\textnormal{\thmnote{ (#3)}}}

\theoremstyle{theoremdd}
\newtheorem{thmd}{Theorem}[section]

\begin{document}

\section{Whatever}

\begin{thmd}
This is a test theorem.
\end{thmd}

\end{document}

Answer 2

你想要一个 Bourbaki 风格的布局吗？使用这个ntheorem包很容易：

\documentclass{book}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[small]{titlesec}
\titleformat{\section}{\normalsize\bfseries}{\thesection.}{0.5em}{}

\usepackage[ thmmarks, thref]{ntheorem}
\usepackage{chngcntr}
\usepackage{cleveref}

\renewcommand\thesection{\arabic{section}}

\theoremstyle{plain}
\theoremheaderfont{\scshape}
\theoremseparator{.~---}
\newtheorem{thm}{Theorem}
\counterwithin*{thm}{chapter}

\pagestyle{plain}

\begin{document}

\section{A first section}
\begin{thm}\label{testthm}
This is a test theorem. 
\end{thm}
We see in \cref{testthm}\dots

\end{document}