\documentclass[12pt]{amsart}

%%The following pakages are available.
\usepackage[mathscr]{eucal}
\usepackage{amscd}
\usepackage{amsfonts}
\usepackage{amsmath, amsthm, amssymb}
\usepackage{latexsym}
\usepackage[dvips]{graphics}

%%%%%%%% Theorem style %%%%%%%%%%%%%%%%%%%%%%%%%%%

\theoremstyle{plain} 
\newtheorem{thm}{Theorem}
\newtheorem{cor}[thm]{Corollary}
\newtheorem{lem}[thm]{Lemma}
\newtheorem{prop}[thm]{Proposition}

\theoremstyle{definition}
\newtheorem{defn}[thm]{Definition}
\newtheorem{ex}[thm]{Example}

\theoremstyle{remark}
\newtheorem{rem}[thm]{Remark}

%%%%%%%%%%%%%%%%%% Equation style %%%%%%%%%%%%%%%%%%

\numberwithin{equation}{section}
\renewcommand{\labelenumi}{(\arabic{enumi})}
\renewcommand{\labelenumii}{(\alph{enumii})}

%%%%%%%%% PRINT SIZE %%%%%%%%%%%%%%%%%%%
\setlength{\textwidth}{16cm} 
\setlength{\textheight}{23cm} 
\setlength{\oddsidemargin}{0cm} 
\setlength{\evensidemargin}{0cm} 
\setlength{\topmargin}{0cm} 
\setlength{\headheight}{0cm} 
\setlength{\headsep}{0cm} 


\begin{document}

%%% definition of AMS subject classification
\newcommand{\subjcls}[1]{\vfill
\hrule width 21mm
\medskip
2010 {\it Mathematics Subject Classification}. #1.}

\thispagestyle{empty}

%%%%%%%%%%%%%%%% Title, Authors, Affiliations, e-mails %%%%%%%%%%%%%%%%

\begin{center}
{\bf\large EXAMPLE  \\      %title first line
  OF ABSTRACT           %title second line
}
\medskip

%% Name(s) of Author(s)
{Name1 and Name2 }
\medskip

%% affiliation(s)
{University Name(s) }

\medskip

%% E-mail(s)
{\it Email}: {\sf mail@address} 

\end{center}

\bigskip

%%%%%%%% TEXT %%%%%%%%%%%%%

%  Abstracts are written here. 

%%%%%%%% REFERENCES %%%%%%%%

\bibliographystyle{amsplain} 
 
\ifx\undefined\bysame 
\newcommand{\bysame}{\leavevmode\hbox to3em{\hrulefill}\,} 
\fi 
\begin{thebibliography}{1} 
 
%\bibitem{AUS:GLOBAL} 
%M. Auslander, {\em Representation theory of artin algebras I}, 
%Comm. Algebra {\bf 1} (1974), 177--268. 

%\bibitem{smalo:GLOBAL1} 
%S. O. Smal$\phi$, {\em Global dimension of special endomorphism rings over artin  algebras}, 
%Illinois J. Math. {\bf 22(3)} (1978), 414--427. 

\end{thebibliography} 


%%% Write AMS subject classification codes.
%%% For instance: \subjcls{18D05, 16W22, 16W50}
\subjcls{}

\end{document}