\documentclass{amsart}

\title{Title}

\author{First Author}
\author{Second Author}

\address[First Author]{Address of the first author}
\email[First Author]{e-mail of the first author}

\address[Second Author]{Address of the second author}
\email[Second Author]{e-mail of the second author}

%\curraddr{curraddr}
%\email{email}
\urladdr{urladdr}
\thanks{The work was supported by \dots}
%\date{\today}
%\dedicatory{The work is dedicated to \dots}
\keywords{Sets, \dots}
%\subjclass[2010]{Primary: 03E40; Secondary: 54E20}
\begin{document}

\maketitle
Text of the abstract.
Text of the abstract.
Text of the abstract.
Text of the abstract.
Text of the abstract.
Text of the abstract.

\begin{thebibliography} {9}

\bibitem{a1}
Authors,
\textit{Title}, Journal.
 
\bibitem{a2}
Authors,
\textit{Title}, Journal.
 
\end{thebibliography}

\end{document}