\documentclass[11pt]{amsart}

% your optional definitions
\newtheorem{thm}{Main Theorem}

%%% mandatory AMS fields
\author[F.\,M.\,Lastname]{Fist Middle Lastname}
\address{Department of Mathematics\\University of ...\\City}
\email{fmlast@math.uni.ac.xx}
\urladdr{http://math.uni.ac.xx/\~{}fmlast}
\title[Observation on circles]{Observation on circles with respect to planes}
\subjclass[2010]{Primary 99Z99; secondary 00A00--99Z98}
\keywords{Circles, planes}
% optional AMS fields
\thanks{This work was supported by ...}

%%% do not change the order of the following
\usepackage{aaa81}
\begin{document}

\begin{abstract}
  The abstract goes here.
\end{abstract}
\maketitle
%%%

Let the article begin ...
\begin{thm}  All circles are round 
\end{thm}
\begin{proof}
By induction on the size, starting with 
$$ o $$
and $$O$$
\end{proof}

First attempts to solve this problem have been made in \cite{bl} and \cite{b2}.

\newpage
contiued 2 ...

\newpage
contiued 3 ...


\begin{thebibliography}{2}
\bibitem{bl}
F.\,M.\,Lastname:
\newblock \textit{My first paper.} 
\newblock J.\,Journalisis, \textbf{9} (1869), 101--105. 
\bibitem{b2}
F.\,M.\,Lastname, F2.\,M2.\,Lastname2:
\newblock \textit{My second paper.}
\newblock J.\,Mathematica, \textbf{3} (1871), 91--97.
\end{thebibliography}

\end{document}
