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\documentclass[twoside,11pt,leqno]{article}        
\usepackage{amssymb}  
\usepackage{amsthm} 

\let\bs=\rm
\let\bsbf=\bf
\let\bsit=\it

\setlength{\paperheight}{10.25in}
\setlength{\paperwidth}{6.75in}
\setlength{\evensidemargin}{0.5in}
\setlength{\oddsidemargin}{0.5in}
\setlength{\marginparwidth}{0.5in}
\setlength{\textwidth}{4.7in}
\setlength{\textheight}{7.5in}
\setlength{\topmargin}{0.0in}
\setlength{\headheight}{0.5in}
\setlength{\headsep}{0.45in}
\flushbottom

%%%%%%%%%%%%%%% thm and the alike are used for numbering 
%%%%%%%%%%%%%%% theorems and such in sections WITHOUT subsections
\newtheorem{thm}{Theorem}[section]

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

%%%%%%%%%%%%%%% thm1 and the alike are used for numbering 
%%%%%%%%%%%%%%% theorems and such in sections withWITH subsections
\newtheorem{thm1}{Theorem}[subsection]

\newtheorem{lem1}[thm1]{Lemma}
\newtheorem{cor1}[thm1]{Corollary}
\newtheorem{prop1}[thm1]{Proposition}

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\theoremstyle{definition}                  

\newtheorem{rem}[thm]{Remark}             
\newtheorem{exam}[thm]{Example}
\newtheorem{defi}[thm]{Definition}

\newtheorem{rem1}[thm1]{Remark}      
\newtheorem{exam1}[thm1]{Example}
\newtheorem{defi1}[thm1]{Definition}
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\newcommand{\rnf}{\renewcommand{\thefootnote}{\arabic{footnote}}}
\newcommand{\thankyou}[2]{\stepcounter{footnote}\footnotetext[#1]{#2}}

\title{\vspace{-3cm}
\ \hspace{-2.70in}
{\small {\bf Morfismos},
Vol. XX, No. XX, 201X,                                                                                                
pp.
        X--X   %the first and last page of the article, for Morfismos use only
}
\\
\vspace{3cm} 
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            %                             %
            %      Fill in the Title      %
            %                             %
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
A (possibly large)\\
title 
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            %                             %
            %      Optional footnotes     %
            %                             %
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\footnote{\bsbf Optional Footnote.}
}

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            %                            %
            %    Fill in the author(s)   %
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\author{\rnf   Author 1
               \footnotemark[1]
\and  \rnf     Author 2
               \footnotemark[2]
%\and  \rnf    Author 3
%              \footnotemark[3]
}

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            %                                   %
            %    Fill in the date (optional)    %
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\date{}

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            %                                   %
            %    To be used by Morfismos only   %
            %                                   %
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%\addtocounter{page}{}

\pagestyle{myheadings}

\markboth{\small Author 1 and Author 2\hfil}{\small\hfil Short Title}

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            %                                      
            %    The previous line is intended for the
            %    author's names (in even numbered pages)
            %    as well as for the proposed 
            %    short title, both for headings   
            %                                            
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\begin{document}
\maketitle

            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
            %                                            %
            %       Grants, address, etc of authors      %
            %                                            %
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\thankyou{1}{Grants for 1st author.}

\thankyou{2}{Grants for 2nd author. If the the work is part of the author's thesis, indicate the degree for which the thesis has been submitted, as well as the advisor's name and adscription.} 

%\thankyou{3}{Grants, Address, etc for 3rd author}

            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
            %                                 %
            %       Fill in the abstract      %
            %                                 %
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{abstract} \noindent
This is the abstract.
\end{abstract}

\noindent \thanks{\it{2010 Mathematics Subject Classification:}
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
            %                                                      %
            %  Fill in the 2010 Mathematics Subject Classification %
            %                                                      %
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Whatever the classification is.
\\
\it{Keywords and phrases:}
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            %                                            %
            %       Fill in the keywords and phrases     %
            %                                            %
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
These are the keywords and phrases.
}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%                                                       %%
%%         This is the beginning of the paper            %%
%%                                                       %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\section{Introduction}
This is the introduction.

\section{New section}
This is a new section.

\begin{thm}\label{teo1}
This is a first theorem.
\end{thm}

\proof This is its proof. \hfill $\Box$

\begin{thm}\label{teo2}
This is a second theorem.
\end{thm}

\proof By Theorem \ref{teo1}, it requires no proof. \hfill $\Box$ 

\section{A section with subsections}

\subsection{A subsection}

This is a subsection.  

\begin{lem1}
This is a lemma.
\end{lem1}

\proof   This is its proof. \hfill $\Box$ 

\subsection{Other subsection}

This is a second subsection.

\begin{prop1}
This is a proposition.
\end{prop1}

\proof   This is its proof. \hfill $\Box$ 

\begin{rem1}\label{rem1}
This is a remark.
\end{rem1}

This is the end of the paper.


\bigskip
{\bf \centerline{Acknowledgement}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%                                               %%
%%     Fill in any acknowledgment (optional)     %%
%%                                               %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
This is the acknowledgment.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%                                             %%
%%         Fill in the author(s) data          %%
%%                                             %%
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\bigskip
\hfill\
{\footnotesize
\parbox{5cm}{Author 1\\
{\it Department of XXXXXX},\\
University of XXXXXXXX,\\
Address,\\
Address,\\
{\sf email1@myuniversity.mycountry}}\
{\hfill}\
\parbox{5cm}{Author 2\\
{\it Department of XXXXX},\\
University of XXXXXXXX,\\
Address,\\
Address,\\
{\sf email2@youruniversity.yourcountry}}}\
\hfill



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%%                                                  %%
%%         This is a sample of references           %%
%%                                                  %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\begin{thebibliography}{999}

\bibitem{CLM} Cohen F.R., Lada T.J. and May J.P.,
The Homology of Iterated Loop Spaces,                                   
Lecture Notes in Math., {\bf 533}, Springer-Verlag (1976).

\bibitem{mfalk} Falk M. and Randell R.,
{\em The lower central series of a fiber-type arrangement},
Inventiones Math., {\bf 82} (1985), 77--88.

\bibitem{config} Fadell E. and Neuwirth L.,
{\em Configuration spaces},
Math.~Scand., {\bf 10} (1962), 111--118.

\bibitem{kane} Kane R.,
{\em The homology of Hopf-spaces},
North-Holland Mathematical Library, {\bf 40} (1988).

\bibitem{serlie} Serre J.P.,
Lie Algebras and Lie Groups,
W.A. Benjamin, Inc. (1965).

\end{thebibliography}

\end{document}

