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I have done a minimal working example by writing

\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage{fancyhdr}

\pagestyle{fancyplain}
\renewcommand{\sectionmark}[1]{\markright{\thesection{} #1}}

\begin{document}

\section{Discussion}
\subsection{Calcul d'erreur}

\cite{ref1} \cite ...

Hello,

I agree that it couldn't be clear. I have joined a printscreen of a page of my work.
I have framed the header to see you my problem. I would like to suppress the word 'Références' of my header. Do you know how to do it? The code for my header is the next thing:

\usepackage{fancyhdr ...

Hello everybody,

I'm writing my work on Latex et I use the article documentclass. I would like to put headers at every page of my work. So I write:

\pagestyle{fancyplain}
\renewcommand{\sectionmark}[1]{\markright{\thesection{} #1}}

by inserting the package fancyhdr. So the section appear in my ...

Thank you very much Stefan .

Excuse me I have forgotten a line of my code :oops:
\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{tikz}

\begin{document}
\begin{eqnarray*}
\cos\theta dF &=& k_{\text{abs}}\rho_{a}dz \\
&\begin ...

Hello everibody,

I'm writing a rapport with a lot equations and I would like to use arrow to move from an equation from an another one. This is the code:

\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage ...