\documentclass [11pt]{article} 
\usepackage{latexsym,amssymb}

%\usepackage{showkeys}
 \renewcommand{\baselinestretch}{1.2}
\textwidth 15  cm % 25  Magnification 0.7
\textheight   22 cm %  35    Magnification 0.7
\oddsidemargin 0 cm
\evensidemargin 0 cm
\marginparwidth 1 cm
\marginparsep 0.4 cm
\marginparpush 0.4 cm
\topmargin 0 cm
\headheight 0.59 cm
\headsep 1.5 cm
\footskip 2.2 cm
\overfullrule=0pt
 \pagestyle{headings}
 
%\def\square{\vrule width.6em height.5em depth.1em\relax}
 
 \newcommand{\demi}{\frac {1}{2}}
 \newcommand{\R} {\mathbb{R}}             %
  \newcommand{\ldeux}{L^2(\Omega)}
\newcommand{\ldeuxg} {L^2(\Gamma)}
\newcommand{\Hundeux}{H^2(\Omega)\cap H^1_o(\Omega)}
\newcommand{\Hunzero}{{H^1_o(\Omega)}}
  
\begin{document}
 
 \thispagestyle{empty}
\begin{center}

{\Large \textbf{Title }}

\vspace{1 cm}
\textsc{ \underline{Corresponding author}}{\footnote{
 Adress\\
Email :  name@blabla}}
  \hspace{0.5cm}
\textsc{ Second author}{\footnote{
Adress2\\
Email : }}
\end{center}

\vspace{ 1 cm}
 
  
  Abstract in latex. No more than two pages

    \end{document}
 
