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\documentclass[a4paper,10pt,fleqn,twoside]{book}\usepackage{amsmath,amssymb,amsfonts,a4wide} % Typical maths resource packages\usepackage{graphics} % Packages to allow inclusion of graphics\usepackage{color} % For creating coloured text and background\usepackage{hyperref} % For creating hyperlinks in cross references\usepackage{epsfig}\usepackage{graphicx}\newtheorem{theorem}{Theorem}[section]\newtheorem{proposition}[theorem]{Proposition}\newtheorem{corollary}[theorem]{Corollary}\newtheorem{lemma}[theorem]{Lemma}\newtheorem{remark}[theorem]{Remark}\newtheorem{definition}[theorem]{Definition}\newtheorem{teo}{Theorem}[section]\usepackage{fancyhdr}\pagestyle{fancy}\renewcommand{\chaptermark}[1]{\markboth{\MakeUppercase{\chaptername \ \thechapter \ \ #1}}{}}\fancyhf{}%clear all header and footer fields\fancyhead[LO]{\nouppercase{\rightmark}}\fancyhead[RE]{\nouppercase{\leftmark}}\fancyhead[RO,LE]{\thepage}\def\chem#1#2{ {{\scriptscriptstyle#1\atop\longrightarrow}\atop{\longleftarrow\atop \scriptscriptstyle#2}} }\begin{document}\begin{titlepage}...\end{titlepage}\thispagestyle{empty}\tableofcontents\renewcommand*\thesection{\arabic{section}}\newpage\section{1}\section{2}