以下是我笔记的部分代码。我想“轻松”创建一个仅显示定义、定理和引理的新文档。我可以复制并粘贴它，然后删除我不想要的内容，但如果有更简单的方法，那就太好了。
\documentclass[12pt,letterpaper]{article}
\usepackage{amsmath} % just math
\usepackage{amssymb} % allow blackboard bold (aka N,R,Q sets)
\usepackage{amsthm} % allows thm environment
\usepackage{mathrsfs}
\usepackage{graphicx, framed} % allows graphics
\usepackage[none]{hyphenat} % allows graphics
\usepackage[usenames,dvipsnames]{color}
\usepackage{color}
\usepackage{wrapfig}
\definecolor{Def}{rgb}{0.85,0.65,0.13}
\definecolor{Ex}{rgb}{0,0.39,0}
\definecolor{Nt}{rgb}{1,0.08, 0.58}
\definecolor{Tm}{rgb}{0,0,0.80}
\definecolor{Pf}{rgb}{1,0.55,0}
\definecolor{white}{rgb}{1,1,1}
\linespread{1.6} % double spaces lines
\textwidth 6.5truein % These 4 commands define more efficient margins
\textheight 9.4truein
\oddsidemargin 0.0in
\topmargin -0.6in
\parskip 5pt % Also, a bit of space between paragraphs
\newtheorem{theorem}{\color{Tm}{\textbf{\underline{Theorem}}}}
\newtheorem{cor}{\color{Tm}{\textbf{\underline{Corollary}}}}
\newtheorem{prop}{\color{Tm}{\textbf{\underline{Proposition}}}}
\newtheorem{claim}{\color{Tm}{\textbf{\underline{Claim}}}}
\theoremstyle{definition}\newtheorem{definition}{\color{Def}{\textbf{\underline{Definition}}}}
\newtheorem{lemma}{\color{Tm}{\textbf{\underline{Lemma}}}}
\newtheorem{exer}{\color{Plum}{\textbf{\underline{Exercise}}}}
\theoremstyle{definition}\newtheorem{note}{\color{Nt}{\textbf{\underline{Note}}}}
\theoremstyle{definition}\newtheorem{example}{\color{Ex}{\textbf{\underline{Example}}}}
\newtheorem{sidebar}{\color{Aquamarine}{\textbf{\underline{Sidebar}}}}
\newtheorem{pf}{\color{BurntOrange}{\textbf{\underline{Proof}}}}
\newcommand{\QEDend}{\linebreak \begin{flushright}\textbf{QED}\end{flushright}}
\newcommand{\QEDish}{\linebreak \begin{flushright}\textbf{$\approx$QED}\end{flushright}}
\newcommand{\bb}[1]{\mathbb{#1}}
\newcommand{\mcal}[1]{\mathcal{#1}}
\newcommand{\scr}[1]{\mathscr{#1}}
\newcommand{\R}[1]{$\mathbb{R}$}
\newcommand{\C}[1]{$\mathbb{C}$}
\newcommand{\N}[1]{$\mathbb{N}$}
\newcommand{\Q}[1]{$\mathbb{Q}$}
\newcommand{\lp}[1]{$\left({#1}\right)$}
\newcommand{\la}[1]{$\left|{#1}\right|$}
\newcommand{\as}[1]{\color{white}{*}\color{black}{}}
\newcommand{\ind}{\hspace*{30pt}}
\newcommand{\done}{\hfill \mbox{\raggedright \rule{0.1in}{0.1in}}}
\newcommand{\bigdotcup}{\ensuremath{\mathop{\makebox[-0.6pt]{\hspace{16pt}{\(\cdot\)}}\bigcup}}}
\newcommand{\dotcup}{\ensuremath{\mathop{\makebox[-0.6pt]{\hspace{13pt}{\(\cdot\)}}\bigcup}}}
\raggedright
\parindent 30pt
\newcommand{\ftheorem}[1]{\begin{framed}\begin{theorem}#1\end{theorem}\end{framed}}
\newcommand{\fdef}[1]{\begin{framed}\begin{definition}#1\end{definition}\end{framed}}
\newcommand{\fnote}[1]{\begin{framed}\begin{note}#1\end{note}\end{framed}}
\newcommand{\flemma}[1]{\begin{framed}\begin{lemma}#1\end{lemma}\end{framed}}
\newcommand{\fex}[1]{\begin{framed}\begin{example}#1\end{example}\end{framed}}
\newcommand{\fcor}[1]{\begin{framed}\begin{corollary}#1\end{corollary}\end{framed}}
\begin{document}
\linespread{1.5} % 1.5 space lines
\section{Course Notes}
%January 23, 2012
\subsection{Metric Spaces}
\begin{definition}The metric space $M$ is a \underline{complete metric space} if every Cauchy sequence is convergent in $M$.
\end{definition}
\begin{example}
$\bb{R}$ is a complete metric space\done
\end{example}
\begin{example}
$C[0,1]$ is a complete metric space with $d(f,g) = \sup \mid f(t) - g(t) \mid$, $t \in [0,1]$.\done
\end{example}
\begin{theorem}
Any closed subset $A$ of a complete metric space $M$ is complete.
\end{theorem}
\begin{proof}
Let $A \subset M$ be closed and $<x_n>$ be any Cauchy sequence in $A$. Since $M$ is a complete metric space, $<x_n>$ is convergent in $M$, so $x_n \rightarrow x \in M$. Since $A$ is closed, $x \in A$. Thus, $A$ is complete.
\end{proof}
\end{document}`
答案1
好吧，你的 MWE 中仍然缺少一些信息，因此它变成了 MNWE;)。但是试试这个：
\documentclass{amsart}
\usepackage[active,
generate=short,
extract-cmd={section},
extract-env={definition,theorem}]{extract}
\begin{extract*}
\usepackage{amsthm}
\newtheorem{theorem}{Theorem}
\theoremstyle{definition}
\newtheorem{definition}{Definition}
\newtheorem{example}{Example}
\end{extract*}
作为序言，编译您的文件并查看文件。有关更多信息，short.tex请参阅软件包的文档（这很重要 - 例如，此软件包会干扰 LaTeX 的内部结构，并且无法用于任何命令！）。简短信息：环境将其内容放入生成的文件中（并像往常一样处理它们）；定义生成的文件的名称，并指定要提取的内容。extractextract*generateextract-cmdextract-env
另外，考虑避免\underline并改用\emph。