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\documentclass[10pt]{amsart}
\usepackage{latexsym}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage{amssymb}
\usepackage[utf8]{inputenx}
\usepackage[a5paper]{geometry}

\renewcommand{\cite}[1]{[#1]}
\newcommand{\presentingauthor}[1]{\author{#1}}

\newtheorem*{theorem}{Theorem}
\newtheorem*{observation}{Observation}
\newtheorem*{lemma}{Lemma}
\theoremstyle{definition}
\newtheorem*{definition}{Definition}
\newtheorem*{question}{Question}

\begin{document}
% THE TITLE OF YOUR TALK OR POSTER
\title{On a theorem of general topology}

% THE PRESENTING AUTHOR
\presentingauthor{First Author}
\address{Street \\ City \\ Country}
\thanks{The first author was partially supported by his/her spouse}
\email{first{@}domain.edu}

% THE (POTENTIAL) COAUTHOR
\author{Second Author}
\address{Street 2\\ City 2\\ Country 2}
\thanks{The second author was partially supported by the ESF}
\email{second{@}domain.edu}


\maketitle


% TEXT OF THE ABSTRACT
Lorem ipsum dolor sit amet, consectetur orci sed adipiscing
(see~\cite{Solecki96}). Quisque in ante sed lacus varius sollicitudin.
Sed interdum, erat sed dictum feugiat, dui quam

\begin{lemma}[Gauss] A wonderful result.
\end{lemma}

Sodales neque, at suscipit mi orci sed ligula. Quisque tincidunt ullamcorper
(see~\cite{Solecki99}) pharetra. Pellentesque quis dui eu libero adipiscing
ultrices at sit amet massa.

\begin{displaymath}
 \lim_{n\to\infty}\sum_{i=1}^n 1/2^i = ??
\end{displaymath}

\begin{theorem} First theorem.
\end{theorem}

Vehicula iaculis. Proin odio orci, lobortis pellentesque facilisis sed,
imperdiet vitae ante. Ut sollicitudin commodo laoreet. Pellentesque metus nisl,
sagittis non rutrum a, vestibulum non enim. Donec aliquam, neque sed scelerisque
tincidunt, nisl eros ornare sapien, in rhoncus dolor libero vitae orci.

\begin{question} To be, or not to be?
\end{question}

\end{document}


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%%%%%%%%%%%%%%%%%  BIBLIOGRAPHY INSTRUCTIONS %%%%%%%%%%%%%%%%%%%%%
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%
% If you want to include references, in the text use \cite command
% and include your references commented out in BibTeX format at the
% end of this file (see the following)
% Note that you should leave out enough space for the references so
% that the abstract WITH references fits on one A5 page
%
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%
% @article{Mathias77,
%   key={Mat77},
%   title={Happy families},
%   author={Mathias, A.R.D.},
%   journal={{Annals of Mathematical Logic}},
%   volume={12},
%   number={1},
%   pages={59--111},
%   year={1977}
% }
% @article{Solecki99,
%   key={Sol99},
%   title={{Analytic ideals and their applications}},
%   author={Solecki, S.},
%   journal={Annals of Pure and Applied Logic},
%   volume={99},
%   number={1-3},
%   pages={51--72},
%   year={1999},
%   publisher={Elsevier}
% }
% @article{Solecki96,
%   key={Sol96},
%   title={{Analytic ideals}},
%   author={Solecki, S.},
%   journal={Bulletin of Symbolic Logic},
%   pages={339--348},
%   year={1996},
%   publisher={Association for Symbolic Logic}
% }
% @article{KPT,
% 	Author = {Kechris, A. S. and Pestov, V. G. and Todorcevic, S.},
% 	Fjournal = {Geometric and Functional Analysis},
% 	Journal = {Geom. Funct. Anal.},
% 	Number = {1},
% 	Pages = {106--189},
% 	Title = {Fra\"\i ss\'e limits, {R}amsey theory, and topological dynamics of automorphism groups},
% 	Volume = {15},
% 	Year = {2005}}s