\documentclass[twoside,12pt,leqno]{article}
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%%%%%       The following are formatting  commands
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%%%%%   Martin Schlichenmaier   24.2.2006
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\widowpenalty=10000
\clubpenalty=10000
\raggedbottom\oddsidemargin .4in
\evensidemargin .4in
\marginparwidth =1in
\textwidth 14.6cm
\topmargin 15mm\textheight 620pt
\advance\topmargin by -\headheight\advance\topmargin by -\headsep
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%%\setcounter{page}{33}
%%\addtocounter{page}{8}
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\newcommand{\tmvolxx}{xx}
\newcommand{\tmyearyyyy}{yyyy}
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\newcommand{\FirstPageHead}[3]{
{\footnotesize 
\vskip -8mm 
\centerline {Travaux math\'ematiques, \quad 
Volume #1 (#2), 
#3,\quad \copyright\  Universit\'e du Luxembourg}}\vspace{-3mm}}



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%%%%%   The following are macro-packages which might be used
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%%%%%%%%%%%    DO NOT CHANGE
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\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{amssymb}
\usepackage{amscd}
\usepackage{graphicx}
\usepackage{epsfig}
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%%The following organizes the numbering of theorem-like 
%%enviroments etc. 
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%  Makes the equation numbering subordinate to the section numbers.
\numberwithin{equation}{section}
%  Theorems, Lemmas and the like, should be typeset in italic
\newtheorem{theorem}{Theorem}[section]
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{proposition}[theorem]{Proposition}
\newtheorem{corollary}[theorem]{Corollary}
\newtheorem{claim}[theorem]{Claim}
\newtheorem{conjecture}[theorem]{Conjecture}
%  Examples, Remarks, Definitions etc. typeset with upshape
\theoremstyle{definition}
\newtheorem{definition}[theorem]{Definition}
\newtheorem{example}[theorem] {Example}
\newtheorem{problem}[theorem]{Problem}
\newtheorem{remark}[theorem]{Remark}
\newtheorem*{remarku}{Remark}
\newtheorem*{exampleu}{Example} % The '*' makes it unnumbered
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%%%%%   If you prefer to numerate each type separately
%%%%%   Comment out the preceedings group of commands and
%%%%%   Uncomment the following group
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%  Makes the equation numbering subordinate to the section numbers.
\numberwithin{equation}{section}
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%% %  Theorems, Lemmas and the like, should be typeset in italic
%% \newtheorem{theorem}{Theorem}[section]
%% \newtheorem{lemma}{Lemma}[section]
%% \newtheorem{proposition}{Proposition}[section]
%% \newtheorem{corollary}{Corollary}[section]
%% \newtheorem{claim}{Claim}[section]
%% \newtheorem{conjecture}{Conjecture}[section]
%% %  Examples, Remarks, Definitions etc. typeset with upshape
%% \theoremstyle{definition}
%% \newtheorem{definition}{Definition}[section]
%% \newtheorem{example}{Example} [section]
%% \newtheorem{problem}{Problem}[section]
%% \newtheorem{remark}{Remark}[section]
%% \newtheorem*{remarku}{Remark}
%% \newtheorem*{exampleu}{Example} % The '*' makes it unnumbered
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\allowdisplaybreaks
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\begin{document}
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%  Leave the following commands
\thispagestyle{empty}
%      The following line will be adapted for  the final
%      print version
\FirstPageHead{\tmvolxx}{\tmyearyyyy}{\pageref{firstpage}--\pageref{lastpage}}
\label{firstpage}
%  Parameters: Volume, year, page range,
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%%%%%%%%  START OF THE CONTRIBUTION
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%%%%  please give some keywords:
%%%%
%%%%
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%%%%
%%%%    Please  give one or more AMS classification numbers
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%%%%    private macros
%%%%    do not use renewcommand (i.e. do not redefine 
%%%%%   standard  Latex-Commands
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%%%%%  end of private macros
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%%%  Here  the top-matter of your Article starts
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%%%%    Please replace by your data 

%%%   This are the running heads (please adapt)
\markboth{your name}{your (short) title}
$ $
\bigskip

\bigskip

%%%%    Title
\centerline{{\Large   Your title}}

%%%   Author
\bigskip
\bigskip
\centerline{{\large by  XXXX (your name)}}


\vspace*{.7cm}

\begin{abstract}

This is  your abstract
\end{abstract}

%%%%   Leave the following commands
\pagestyle{myheadings}
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\section{Introduction}

This is your introduction.

\section{This is the next section}

\begin{theorem}\label{null}
This is the statement of the theorem.
\end{theorem}

\begin{proof}
This is the proof of the theorem.
\end{proof}


The above Theorem \ref{null} is very useful.
It can be found  in 
\cite{GH}.

\section{This is the next section, etc.}

\begin{theorem}\label{one}
This is the statement of the theorem.
\end{theorem}

The following is a proposition

\begin{proposition}
$-1=\exp{\pi i}$.
\end{proposition}

\begin{remarku}
This is an unnumbered remark.
\end{remarku}

\begin{remark}
This is an numbered remark.
\end{remark}


The following is a numbered equation
\begin{equation}
-1=\exp{\pi i}.
\end{equation}

The following is a unnumbered equation
\begin{equation*}
-1=\exp{\pi i}.
\end{equation*}



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%%%%%          The bibliography
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\begin{thebibliography}{11}
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\bibitem{GH}
Ph. Griffiths and J.~Harris, \emph{Principles of algebraic geometry}, John
  Wiley, New York, 1978.


\end{thebibliography}
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%% The address
\noindent 
       your name \\
      your address 1\\
      your address 2\\
      etc.\\
      your email
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%%%%%%%%%%%%%  Leave the following command
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\label{lastpage}
\end{document}