Page Layout ⇒ subsection dividing

[teddy0625]

Code: Select all

\documentclass[a4paper,12pt,twoside]{book}
\usepackage{amsmath,amssymb,amsfonts,geometry} % Typical maths resource packages
\usepackage{xcolor}                    % For creating coloured text and background
\usepackage{hyperref}                 % For creating hyperlinks in cross references
\usepackage{graphicx}
\usepackage{pstricks}

\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]
\numberwithin{section}{chapter}

\usepackage{fancyhdr}
%def "fancy" pagestyle
\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}
\begin{center}
\vspace*{5mm}
\Huge  Hydrodynamic Stability and Flow Transitions\\
\vspace*{50mm}
\includegraphics[scale=0.7]{shield.pdf}
\vfill
\rm
{\LARGE } \\
\vspace*{25mm}
\small
\end{center}
\end{titlepage}
\newpage
\thispagestyle{empty}


\tableofcontents
\renewcommand*\thesection{\arabic{section}}
\clearpage{\pagestyle{empty}\cleardoublepage}

\newpage
\thispagestyle{empty} 

\newpage
\chapter*{Abstract}
\addcontentsline{toc}{chapter}{Abstract}


\chapter*{Notation}
\addcontentsline{toc}{chapter}{Notation}
\begin{table}[h!]
%\begin{small}
\begin{tabular}{l c l}
$x,y,z$& - & Cartesian coordinates \\ \\
$t$& - & Time\\ \\
$u,v,w$ & - & Eulerian components of the fluid velocity \\ \\
$U,V,W$ & - & Mean velocity components\\ \\
$\alpha$& - & Wave number in x direction \\ \\
$\beta$& - & Wave number in z direction \\ \\
$c=c_{r}+\mathbf{i}c_{\mathbf{i}}$& - & Complex phase velocity \\ \\
$\phi$& - & Eigenfunction \\ \\
$\psi$& - & Stream function\\ \\
$R$& - & Reynolds number of the mean flow, based on free stream velocity \\ \\
$\nu$ & - & Kinematic fluid Viscosity \\ \\
$',d/dy$ & - & Ordinary derivative\\ \\
$x,y,z,t$ & - & In subscript, partial derivative\\ \\
$*$  & - & In superscript, complex conjugate\\
%$\epsilon$& - & perturbation parameter \\
%$\zeta$& - & eigenvalue \\
\end{tabular}
\end{table}
\addcontentsline{toc}{chapter}{Notation}


\newpage
\chapter{Preliminaries}%-----------------------------Preliminaries------------------------------------------------------------------------

\section{Introduction to hydrodynamic stability} %---------------------------- section 1.1--------------------------------------
In fluid dynamics, hydrodynamic stability concerns the stability and instability of fluid flows. Hydrodynamic stability is an important phenome
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hi.
I am having a trouble dividing sections for each chapter. I want to display 3 sections under chapter 1 (Preliminaries) as 1.1 , 1.2 and 1.3 but I do not know how. help please

[localghost]

Right after your command for the ToC there is a line that causes this behaviour.

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\renewcommand*\thesection{\arabic{section}}

Delete this line and the section counter will be displayed as set by default.

There is one more line that is completely unnecessary and thus can be deleted.

Code: Select all

\numberwithin{section}{chapter}

The counter for section is reset with each new chapter by default.

Finally just one hint. The geometry package has nothing to do with mathematics. It is for setting up page and paper dimensions. You should not group it with other packages in order to pass some specific options to it.


Best regards
Thorsten