documentclass[12pt, a4paper, twoside, openright]{book}

title{}
author{}
date{}

usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage[french, english]{babel}
usepackage{amsfonts, amssymb, amsmath}
usepackage{color}
usepackage{graphicx}
usepackage[all, cmtip]{xy}
usepackage{amsthm}
usepackage{stmaryrd}
usepackage{appendix}
usepackage{scrextend}
usepackage{lipsum}
usepackage[linkcolor=blue, citecolor=green, colorlinks=true]{hyperref}
usepackage{array}
usepackage{makeidx}
usepackage[Lenny]{fncychap}
makeindex
usepackage{minitoc}
usepackage{enumitem}
usepackage[intoc]{nomentbl}

makenomenclature
renewcommand{nomname}{List of Abbreviations and Symbols}
setlength{nomitemsep}{-parsep}
usepackage{titlesec}
newcolumntype{L}{>{$}c<{$}}
numberwithin{equation}{section}
allowdisplaybreaks

usepackage{newtxtext, newtxmath}
usepackage{fullpage}

setlength{footskip}{1.95cm}
setlength{parindent}{1em}
setlength{parskip}{0em}

newenvironment{myitemize}
{ begin{itemize}
    setlength{itemsep}{0pt}
    setlength{parskip}{0pt}
    setlength{parsep}{0pt}     }
{ end{itemize}                  }

newcommand{nocontentsline}[3]{}
%newcommand{tocless}[2]{bgroupletaddcontentsline=nocontentsline#1{#2}egroup}

%environnements mathématiques
theoremstyle{plain}
newtheorem{thm}{Theorem}
newtheorem{mythm}{Theorem}
newtheorem{coro}[mythm]{Corollary}
renewcommand*{themythm}{Alph{mythm}}
newtheorem{mythmfr}{Théorème}
renewcommand*{themythmfr}{Alph{mythmfr}}
newtheorem{corofr}[mythmfr]{Corollaire}
newtheorem{lem}{Lemma}
newtheorem{prop}{Proposition}
newtheorem{conj}{Conjecture}
newtheorem{myconj}{Conjecture}
renewcommand*{theconj}{Alph{myconj}}
newtheorem{myconjfr}{Conjecture}
renewcommand*{themyconjfr}{Alph{myconjfr}}
newtheorem{pb}{textbf{Problem}}
theoremstyle{definition}
newtheorem{defi}{Definition}
theoremstyle{plain}
newtheorem{thmfr}{Théorème}
newtheorem{lemfr}{Lemme}
newtheorem{propfr}{Proposition}
newtheorem{conjfr}{Conjecture}
newtheorem{pbfr}{textbf{Problème}}
theoremstyle{definition}
newtheorem{defifr}{Définition}

newenvironment{note}{begin{minipage}{dimexprlinewidth - 1cm} small textsc{Note.}}{end{minipage} normalsize}
newcommand{didier}[1]{{sf $spadesuitspadesuitspadesuit$ Didier: [#1]}}
newcommand{ian}[1]{{sf $ clubsuitclubsuitclubsuit$ Ian: [#1]}}

usepackage{fancyhdr}
pagestyle{plain}

renewenvironment{note}{begin{minipage}{dimexprlinewidth - 1cm} small textsc{Note.}}{end{minipage} normalsize}

%numberwithin{equation}{chapter}

usepackage{chngcntr}
counterwithout{equation}{section}
renewcommand{theequation}{thechapter.arabic{equation}}

setcounter{minitocdepth}{1}

usepackage{tocloft}
%
setlengthcftparskip{1pt}
setlengthcftbeforechapskip{5pt}

usepackage{fancyhdr}
setlength{headheight}{15.2pt}
pagestyle{fancy}
fancypagestyle{fancybook}{
    fancyhf{}%
    addtokomafont{pagehead}{tiny}
    % Note the ## here. It's required because fancypagestyle is making a macro (ps@fancybook).
    % If we just wrote #1, TeX would think that it's the argument to ps@fancybook, but
    % ps@fancybook doesn't take any arguments, so TeX would complain with an error message.
    % You are not expected to understand this.
    renewcommand*{sectionmark}[1]{ markright{thesection ##1} }%
    renewcommand*{chaptermark}[1]{ markboth{chaptername thechapter: ##1}{} }%
    % Increase the length of the header such that the folios
    % (typography jargon for page numbers) move into the margin
    fancyhfoffset[LE]{6mm}% slightly less than 0.25in
    fancyhfoffset[RO]{6mm}%
    % Put some space and a vertical bar between the folio and the rest of the header
    }

    renewcommand{headrulewidth}{1.5pt}

fancyhead[lo]{slshapenouppercase{rightmark}}
fancyhead[re]{slshapenouppercase{leftmark}}
fancyhead[ro, le]{thepage}

makeatletter
let@oddfoot@empty
let@evenfoot@empty
makeatother

usepackage{longtable}

usepackage[headsep=.25in, textheight=675pt]{geometry}

dominitoc
titleformat*{subsubsection}{normalsizeitshape}
usepackage{thmtools}
renewcommand{listtheoremname}{List of theorems}

begin{document}