关于 \include 的疑难解答

Question

我对 \include 有如下问题

\documentclass[12pt]{amsart}

\usepackage{amsfonts}
\usepackage{amsmath}

\usepackage{amssymb,amsmath,epsfig,graphics}


\title{Title}

\author{My name}

\address{Department of Mathematics\\Nice Town} \email{[email protected]}
\thanks{First author supported in part by
tex.stackexchange}

\begin{document}

\include{abstract}
%\include{introduction}
%\include{chapter1}
%\include{chapter2}
%\include{bibliography}
\end{document} 

摘要文件的位置

\begin{abstract}
We study some functional inequalities satisfied by differential equations. Such    functional inequalities are obtained through new integration by parts formulas by using the Gronwall lemma.
\end{abstract} 

最后我没有摘要。

欢迎任何帮助。

Answer 1

放在\maketitle后面\include{abstract}。