\documentclass[11pt,a4paper]{article}

\usepackage[utf8]{inputenc}
\usepackage[french]{babel} %for an english abstract use: \usepackage[english]{babel}
\usepackage[T1]{fontenc}
\usepackage{fancyhdr}
\usepackage{amsfonts,amsmath,amssymb}
\usepackage{hyperref}




\begin{document}
\title{\bf\LARGE{Le titre de mon exposé}}                         %title
\author{\Large{John Doe}\\                                      %first and last name
        \it{Univeristy of NoWhere, Lost city, COUNTRY}\\        %affiliation
        \href{}{jdoe@yahoo.com}}                                %email
\date{\today}
\maketitle

Ceci est le résumé de mon exposé. Je considérerai l'équation
\begin{equation}
a^2+b^2=c^2
\end{equation}
and I will try to solve it for $a,b,c$ by using the guessing method. 


Citations if necessary (see e.g. \cite{Ahlfors}), inline equation(s) $\int_a^b \frac{x}{x^2+1} dx$,  and more text here \ldots

%if a joint work, add the following line
\bigskip\textbf{Acknowledgment:} this is a joint work with Mary Doe (affiliation, email) and Michael Doe (affiliation, email).


\begin{thebibliography}{00}                                              %only if needed
\bibitem{Ahlfors} Lars V. Ahlfors, {\em Complex analysis}, Mc-Graw-Hill, Inc., N.Y., 1979.
\end{thebibliography}

%%\clearpage


\end{document} 