tcbtheorem 的集合数

Question

LaTeX对于、等中的普通定理环境amslatex，您可以轻松设置定理编号，例如通过临时设置适当的计数器，或者通过重新定义创建标签的函数等。

tcolorbox创建的定理环境是否\newtcbtheorem具有重置定理数字的功能。

这是一个最小的例子。我需要做什么才能使本文档中的定理成为“定理 7.9”？

\documentclass{article}
\usepackage{tcolorbox}
\tcbuselibrary{theorems}
\newtcbtheorem{Theorem}{Theorem}{}{Th}
\begin{document}
\begin{Theorem}{}{}
  We have $2 + 2 = 4$.
\end{Theorem}
\end{document}

Answer 1

据我所知，除了使用密钥之外，该tcolorbox包没有其他简单的方法来操作计数器值code=

code={\setcounter{\tcbcounter}{8}}其中，\tcbcounter用所用盒子的实际计数器名称替换。

可以number within=section 实现定理计数器在节内的自动复位。

\documentclass{article}
\usepackage{tcolorbox}
\tcbuselibrary{theorems}
\newtcbtheorem[number within=section]{Theorem}{Theorem}{}{Th}


\begin{document}

\setcounter{section}{6}
\section{My nice section}
\begin{Theorem}[code={\setcounter{\tcbcounter}{8}}]{}{}
  We have $2 + 2 = 4$.
\end{Theorem}
\end{document}

更新

\documentclass{article}
\usepackage{tcolorbox}
\tcbuselibrary{theorems}
\newtcbtheorem[number within=section]{Theorem}{Theorem}{}{Th}

\makeatletter
\newcommand{\providetcbcountername}[1]{%
  \@ifundefined{c@tcb@cnt@#1}{%
    --undefined--%
  }{%
    tcb@cnt@#1%
  }
}

\newcommand{\settcbcounter}[2]{%
  \@ifundefined{c@tcb@cnt@#1}{%
    \GenericError{Error}{counter name #1 is no tcb counter }{}{}%
  }{%
    \setcounter{tcb@cnt@#1}{#2}%
   }%
}%

\newcommand{\displaytcbcounter}[1]{% Wrapper for \the...
  \@ifundefined{thetcb@cnt@#1}{%
    \GenericError{Error}{counter name #1 is no tcb counter }{}{}%
  }{%
    \csname thetcb@cnt@#1\endcsname% 
  }%
}


\begin{document}

\setcounter{section}{6}
\section{My nice section}

\settcbcounter{Theorem}{8}

The counter for theorem is \providetcbcountername{Theorem} and it has the value of \displaytcbcounter{Theorem}

\begin{Theorem}{}{}
  We have $2 + 2 = 4$.      
\end{Theorem}
\end{document}

Answer 2

您可以使用 *-variant：

\documentclass{article}
\usepackage{tcolorbox}
\tcbuselibrary{theorems}

\providecommand\theoremnumber{}
\newtcbtheorem{Theorembase}{Theorem \theoremnumber}{}{Th}
\newenvironment{Theorem}[1]
 {\renewcommand{\theoremnumber}{#1}\begin{Theorembase*}}
 {\end{Theorembase*}}

\begin{document}

\begin{Theorem}{7.9}{}
We have $2 + 2 = 4$.
\end{Theorem}

\end{document}

的第二个参数\begin{theorem}是可选标题，就像普通tcb定理一样。