Page Layout ⇒ subsection dividing

[teddy0625]

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Code, edit and compile here:

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\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
 
 
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Run LaTeX here

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}}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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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.

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1
\numberwithin{section}{chapter}
 
 
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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