组织计数器（新定理）

Question

我正在写一些笔记，但在组织上遇到了问题。我定义定理如下：

\documentclass[12pt,a4paper]{book}

\theoremstyle{plain}
\newtheorem{teo}{Teorema}[chapter]
\newtheorem{theo}[teo]{Theorem}
\newtheorem{coro}[teo]{Corolary}
\newtheorem{lema}[teo]{Lemma}
\newtheorem{prop}[teo]{Proposition}

\theoremstyle{definition}
\newtheorem{df}[teo]{Definition}
\newtheorem{ex}[teo]{Example}
\newtheorem{obs}[teo]{Remark}

\begin{document}

\end{document}

在文本中，定理、定义、命题等都在同一个“反面”。我的意思是

定理 1.5

命题 1.6

例 1.7

我想组织如下：

\documentclass[12pt,a4paper]{book}

\theoremstyle{plain}
\newtheorem{teo}{Teorema}[chapter]
\newtheorem{theo}[teo]{Theorem}
\newtheorem{coro}[teo]{Corolary}
\newtheorem{lema}[teo]{Lemma}
\newtheorem{prop}[teo]{Proposition}

\theoremstyle{definition}
\newtheorem{df}[teo]{Definition}
\newtheorem{ex}[teo]{Example}
\newtheorem{obs}[teo]{Remark}

\begin{document}

\chapter{ONE}

  \section{1}

     Proposition 1
     Theorem 1

  \section{2}

     Theorem 2
     Example 1

\chapter{TWO}

  \section{1}

     Proposition 1
     Theorem 1

  \section{2}

     Theorem 2
     Example 1


\end{document}

可以这样做吗？

Answer 1

这里您可以：删除所有可选项[teo]，替换可选项 [section] with[chapter] , and redefine\theteo`，&c，这样它就不会包含章节编号作为前缀。

\documentclass[12pt,a4paper]{book}
\usepackage{amsthm}
\theoremstyle{plain}
\newtheorem{teo}{Teorema}[chapter]
\newtheorem{theo}{Theorem}[chapter]
\newtheorem{coro}{Corollary}[chapter]
\newtheorem{lema}{Lemma}[chapter]
\newtheorem{prop}{Proposition}[chapter]

\renewcommand{\theteo}{\arabic{teo}}
\renewcommand{\thetheo}{\arabic{theo}}
\renewcommand{\thecoro}{\arabic{coro}}
\renewcommand{\thelema}{\arabic{lema}}
\renewcommand{\theprop}{\arabic{prop}}

\theoremstyle{definition}
\newtheorem{df}{Definition}[chapter]
\newtheorem{ex}{Example}[chapter]
\newtheorem{obs}{Remark}[chapter]
\renewcommand{\thedf}{\arabic{df}}
\renewcommand{\theex}{\arabic{ex}}
\renewcommand{\theobs}{\arabic{obs}}

\begin{document}

\chapter{ONE}

  \section{1}
    \begin{prop}
         Proposition 1
    \end{prop}
     \begin{theo}
     A first theorem
    \end{theo}

  \section{2}

     \begin{theo}
     Another theorem
    \end{theo}
    \begin{ex}
      A funny example.
    \end{ex}

\chapter{TWO}

  \section{1}

    \begin{prop}
         Another proposition.
    \end{prop}

     \begin{theo}
     A first theorem in chap. two
    \end{theo}

  \section{2}

     \begin{theo}
     A second theorem in chap. two
    \end{theo}
    \begin{ex}
      A silly example.
    \end{ex}

\end{document}