我想知道为什么 AMSart 声称支持分段和章节，却根本不编译我的章节标题。我这里有一个不起作用的示例，它表明节和章节命令都不起作用。有人能帮我弄清楚如何将章节和节放在那里吗？非常感谢！
\documentclass[12pt]{amsart} %You need this
%\usepackage[foot]{amsaddr} %Puts authors' affiliations below names
\usepackage{amssymb} %More math symbols
\usepackage{mathtools} %More math symbols
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{graphicx} %Insert pictures
\usepackage{amsmath,amssymb,amsthm} %Lets you use math
\usepackage{tikz} %Graphs
\usepackage{setspace} %Allows margin and text spacing options
\usepackage{xcolor} %Color
\usepackage{pdfpages} %Lets you append pdfs
\usepackage[sort]{natbib} %For the bibliography
\bibpunct{(}{)}{;}{a}{,}{,} %Punctuation in bibliography
\usepackage{datenumber} %More formatting options for date
%\usepackage[implicit=true]{hyperref}
\usepackage{url} %Lets you link items
\usepackage{tabularx} %Prettier tables, if we're doing them in LaTeX
\usepackage{xcolor} %Colors
\usepackage{needspace} %Insert pagebreak if not enough space
%
%Old ones
%\documentclass[a4paper,aps,superscriptaddress,nofootinbib]{revtex4}
\usepackage[latin9]{inputenc}
\setcounter{secnumdepth}{3}
%\usepackage{hyperref}
\usepackage{epsfig}
\usepackage{enumerate}
\usepackage{epstopdf}
\usepackage{etoolbox} %To generate the bibliography in aps, we need this.
\usepackage{rotating} %To use with the enviroments begin sideways etc.
\usepackage[T1]{fontenc} %To prevent unexpected results when this text is copied.
\usepackage{pbox}
\usepackage[english]{babel}
\usepackage{tikz} %Das ist kein Zeichenprogramm.
\usepackage{graphics}
\usepackage[citecolor= black,colorlinks=true,linkcolor = black,urlcolor = black]{hyperref}
%\usepackage{hypernat}
\usepackage{pdflscape}
\usepackage{graphicx}
\usepackage{enumerate}
\usepackage{setspace} %This allows spacing
\usepackage[a4paper,margin=20mm,footskip=.5cm]{geometry} %The geometry package allows the adjustment of the margin.
\usepackage{titlesec} %This is for the spacing of section titles.
\usetikzlibrary{decorations.pathreplacing}
%End of packages and libraries.
\makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LyX specific LaTeX commands.
\special{papersize=\the\paperwidth,\the\paperheight}
%% Because html converters don't know tabularnewline
\providecommand{\tabularnewline}{\\}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Textclass specific LaTeX commands.
\@ifundefined{textcolor}{}
{%
\definecolor{BLACK}{gray}{0}
\definecolor{WHITE}{gray}{1}
\definecolor{RED}{rgb}{1,0,0}
\definecolor{GREEN}{rgb}{0,1,0}
\definecolor{BLUE}{rgb}{0,0,1}
\definecolor{CYAN}{cmyk}{1,0,0,0}
\definecolor{MAGENTA}{cmyk}{0,1,0,0}
\definecolor{YELLOW}{cmyk}{0,0,1,0}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
% latex advancedlab ; dvips -Ppdf -t letter -G0 advancedlab
%%%New commands
\newcommand{\?}{'\-\nobreak\hspace{0pt}} %This introduces a nifty apostrophe
\newcommand\mycite[1]{% with Numbers
\citeauthor{#1}~(\citeyear{#1})\@
}
\DeclareMathOperator{\vect}{vec}
\DeclareMathOperator{\vectbr}{vecb_{r}}
\DeclareMathOperator{\col}{col}
\DeclareMathOperator{\var}{var}
\DeclareMathOperator{\tr}{tr}
\DeclareMathOperator{\rank}{rank}
\newcommand{\distas}[1]{\mathbin{\overset{#1}{\kern\z@\sim}}}%
\newsavebox{\mybox}\newsavebox{\mysim}
\newcommand{\distras}[1]{%
\savebox{\mybox}{\hbox{\kern3pt$\scriptstyle#1$\kern3pt}}%
\savebox{\mysim}{\hbox{$\sim$}}%
\mathbin{\overset{#1}{\kern\z@\resizebox{\wd\mybox}{\ht\mysim}{$\sim$}}}%
}
%\renewcommand{\baselinestretch}{1.5}
%Commands for layout
\linespread{1.3} %This is about one and half-spaced
\setlength{\parskip}{4mm plus 2mm minus 3mm} %Here we have spaces between paragraphs.
%\titlespacing*{<command>}{<left>}{<before-sep>}{<after-sep>}
\titlespacing*{\section}{0pt}{2mm plus 1mm minus 1mm}{2ex}
\titlespacing*{\subsection}{0pt}{2mm plus 1mm minus 1mm}{2ex}
%%% End of layout commands.
\makeatother
\newtheorem{prop}{Proposition}
\newtheorem{define}{Definition}
\newtheorem{asm}{Assumption}
\newtheorem{lma}{Lemma}
\newtheorem{thm}{Theorem}
\newtheorem{qn}{Question}
\newtheorem{rmk}{Remark}
\newtheorem{clm}{Claim}
\newtheorem{obs}{Observation}
\begin{document}
\vspace{0.6cm}
\title{Title}
\author{Me}
%\affiliation{My Uni}
%
\date{\today}
%
\begin{abstract}
\vspace{2mm}
My abstract
\end{abstract}
\maketitle
\chapter{My strange Chapter Title}
Sample text
%\section{My Failing Section Title}
Hello
\pagebreak
\bibliographystyle{ecta}
\makeatletter
\renewcommand\@biblabel[1]{\hspace*{\labelwidth}}
\apptocmd{\NAT@thebibliography}{\setlength\itemindent{-14pt}}{}{}
\makeatother
\bibliography{/Users/Jerome/Dropbox/Bibliography/bibo}
\end{document}
答案1
> \chapter=undefined.
l.16 \show\chapter
?
(/usr/local/texlive/2014/texmf-dist/tex/latex/natbib/natbib.sty)
> \chapter=\relax.
l.18 \show\chapter
amsart 没有定义章节（就像article没有一样）。
您会收到一条错误消息，但不幸的是natbib它被定义为默默忽略，这实际上是该软件包中的一个错误。
\documentclass[12pt]{amsart} %You need this
%\usepackage[foot]{amsaddr} %Puts authors' affiliations below names
\usepackage{amssymb} %More math symbols
\usepackage{mathtools} %More math symbols
% no \usepackage{amsmath}
\usepackage{amsthm}
\usepackage{graphicx} %Insert pictures
% no \usepackage{amsmath,amssymb,amsthm} %Lets you use math
\usepackage{tikz} %Graphs
\usepackage{setspace} %Allows margin and text spacing options
\usepackage{xcolor}
\show\chapter %Color
\usepackage{pdfpages} %Lets you append pdfs
\usepackage[sort]{natbib} %For the bibliography
\bibpunct{(}{)}{;}{a}{,}{,} %Punctuation in bibliography
\usepackage{datenumber} %More formatting options for date
%\usepackage[implicit=true]{hyperref}
\usepackage{url} %Lets you link items
\usepackage{tabularx} %Prettier tables, if we're doing them in LaTeX
\usepackage{xcolor} %Colors
\usepackage{needspace} %Insert pagebreak if not enough space
%
%Old ones
%\documentclass[a4paper,aps,superscriptaddress,nofootinbib]{revtex4}
\usepackage[latin9]{inputenc}
\setcounter{secnumdepth}{3}
%\usepackage{hyperref}
% No!! \usepackage{epsfig}
\usepackage{enumerate}
\usepackage{epstopdf}
\usepackage{etoolbox} %To generate the bibliography in aps, we need this.
\usepackage{rotating} %To use with the enviroments begin sideways etc.
\usepackage[T1]{fontenc} %To prevent unexpected results when this text is copied.
\usepackage{pbox}
\usepackage[english]{babel}
\usepackage{tikz} %Das ist kein Zeichenprogramm.
%no \usepackage{graphics}
\usepackage[citecolor= black,colorlinks=true,linkcolor = black,urlcolor = black]{hyperref}
%\usepackage{hypernat}
\usepackage{pdflscape}
% no \usepackage{graphicx}
% no \usepackage{enumerate}
% no \usepackage{setspace} %This allows spacing
\usepackage[a4paper,margin=20mm,footskip=.5cm]{geometry} %The geometry package allows the adjustment of the margin.
%\usepackage{titlesec} %This is for the spacing of section titles.
\usetikzlibrary{decorations.pathreplacing}
%End of packages and libraries.
\makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LyX specific LaTeX commands.
% no\special{papersize=\the\paperwidth,\the\paperheight}
%% Because html converters don't know tabularnewline
\providecommand{\tabularnewline}{\\}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Textclass specific LaTeX commands.
\@ifundefined{textcolor}{}
{%
\definecolor{BLACK}{gray}{0}
\definecolor{WHITE}{gray}{1}
\definecolor{RED}{rgb}{1,0,0}
\definecolor{GREEN}{rgb}{0,1,0}
\definecolor{BLUE}{rgb}{0,0,1}
\definecolor{CYAN}{cmyk}{1,0,0,0}
\definecolor{MAGENTA}{cmyk}{0,1,0,0}
\definecolor{YELLOW}{cmyk}{0,0,1,0}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
% latex advancedlab ; dvips -Ppdf -t letter -G0 advancedlab
%%%New commands
\newcommand{\?}{'\-\nobreak\hspace{0pt}} %This introduces a nifty apostrophe
\newcommand\mycite[1]{% with Numbers
\citeauthor{#1}~(\citeyear{#1})\@
}
\DeclareMathOperator{\vect}{vec}
\DeclareMathOperator{\vectbr}{vecb_{r}}
\DeclareMathOperator{\col}{col}
\DeclareMathOperator{\var}{var}
\DeclareMathOperator{\tr}{tr}
\DeclareMathOperator{\rank}{rank}
\newcommand{\distas}[1]{\mathbin{\overset{#1}{\kern\z@\sim}}}%
\newsavebox{\mybox}\newsavebox{\mysim}
\newcommand{\distras}[1]{%
\savebox{\mybox}{\hbox{\kern3pt$\scriptstyle#1$\kern3pt}}%
\savebox{\mysim}{\hbox{$\sim$}}%
\mathbin{\overset{#1}{\kern\z@\resizebox{\wd\mybox}{\ht\mysim}{$\sim$}}}%
}
%\renewcommand{\baselinestretch}{1.5}
%Commands for layout
\linespread{1.3} %This is about one and half-spaced
\setlength{\parskip}{4mm plus 2mm minus 3mm} %Here we have spaces between paragraphs.
%\titlespacing*{<command>}{<left>}{<before-sep>}{<after-sep>}
\titlespacing*{\section}{0pt}{2mm plus 1mm minus 1mm}{2ex}
\titlespacing*{\subsection}{0pt}{2mm plus 1mm minus 1mm}{2ex}
%%% End of layout commands.
\makeatother
\newtheorem{prop}{Proposition}
\newtheorem{define}{Definition}
\newtheorem{asm}{Assumption}
\newtheorem{lma}{Lemma}
\newtheorem{thm}{Theorem}
\newtheorem{qn}{Question}
\newtheorem{rmk}{Remark}
\newtheorem{clm}{Claim}
\newtheorem{obs}{Observation}
\begin{document}
\vspace{0.6cm}
\title{Title}
\author{Me}
%\affiliation{My Uni}
%
\date{\today}
%
\begin{abstract}
\vspace{2mm}
My abstract
\end{abstract}
\maketitle
\section{My strange Chapter Title}
Sample text
%\section{My Failing Section Title}
Hello
\pagebreak
\bibliographystyle{ecta}
\makeatletter
\renewcommand\@biblabel[1]{\hspace*{\labelwidth}}
\apptocmd{\NAT@thebibliography}{\setlength\itemindent{-14pt}}{}{}
\makeatother
\bibliography{/Users/Jerome/Dropbox/Bibliography/bibo}
\end{document}