2010 Mathematics Subject Classification 如何运行出来 2020...？

用CTEX系统 winedit10.0版本 运行不出来，把 2010改成 2020运行出来 是1991

\documentclass[11pt,reqno]{amsart}
\usepackage{bbm}
\usepackage{mathrsfs}
\usepackage{mathbbold}
\usepackage{amsfonts}
\allowdisplaybreaks
\usepackage{amsmath,amsthm,amsfonts,amssymb,latexsym,epsfig}
\usepackage{hyperref}

\date{today}
\begin{document}
\setcounter{page}{1}

\title[On a ]
{On }

\author[X.-Y. ]{X}

\vskip.10in
\address{
 School of  China.
}


\subjclass[2010]{Primary 30C62, 30C55; Secondary 31C45, 31A05.}

\keywords{pre-Schwarzian derivative.}

\date{\today}


\begin{abstract}
In this paper,
\end{abstract}
\maketitle


\section{Introduction and statements of the main results}\label{sec-1}
p

\vskip .20in
\begin{center}{\sc Acknowledgments}
\end{center}

\vskip.01in
The present investigation


\vskip.12in

\begin{thebibliography}{99}

\bibitem{Ahlfors-1974}
L. V. Ahlfors, Sufficient conditions



\end{thebibliography}

\end{document}

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