\documentclass[11pt]{amsart}
\usepackage{geometry}        
\geometry{a4paper}
\usepackage{amsmath,amsthm,fullpage,graphicx}

\newtheorem{theorem}{Theorem}
\newtheorem{proposition}{Proposition}
\newtheorem{lemma}{Lemma}
\newcommand{\auth}[1]{{\sc #1}}
\newcommand{\tit}[1]{{\it #1}}
\newcommand{\jou}[1]{{ #1}}



\title{Title of my abstract}
\author{Single Author}
\address{Affiliation of Single Author}
\email{(optional) singleauthor@singleauthor.com}
\urladdr{(optional) www.singleauthor.com}

\begin{document}

\maketitle
\thispagestyle{empty}

I will prove the following results:
\begin{theorem} This is my theorem.
\end{theorem}

See also \cite{euclid}.

This is a joint work with Second Author, Third Author. 

Guidelines:
\begin{itemize}
\item The abstract is 1 page only, in English or in Italian.
\item You can provide a single image, to be uploaded in the form.
\item Please do not provide additional files (except one image if needed).
\end{itemize}

\vspace{1cm}
Use the code below if you want to insert an image:
\begin{verbatim}
\begin{figure}[htb]
\includegraphics[width=XXXcm]{myimage.pdf}
(optional) \caption{My image}
\end{figure}
\end{verbatim}

\begin{thebibliography}{9}
\bibitem{euclid} \auth{Euclid}, \tit{Elements}, \jou{Library of Alexandria}, pp. 1--10,  300 B.C.
\end{thebibliography}

\vfill
\hrule


\end{document}  