\newtheorem{ppte}{Propri\'et\'e} \newtheorem{theo}{Th\'eor\`eme} \newtheorem{defi}{D\'efinition} \newtheorem{lemme}{Lemme} \newtheorem{coro}{Corollaire} \newtheorem{prop}{Proposition} \newtheorem{reg}{Règle} \newcommand{\rema}{\underline{Remarque}} \newcommand{\exe}{\underline{Exemple}} \newcommand{\pre}{\underline{Preuve}} \newcommand{\cas}{\underline{Cas particulier}} \newcommand{\cass}{\underline{Cas particuliers}} \newcommand{\Not}{\underline{Notation}} \newcommand{\Si}{\underline{Si} } \newcommand{\alors}{\underline{alors} } \newcommand{\cons}{\underline{Conséquence}} \def\qed{\hfill\raise -2pt\hbox{\vrule\vbox to 10pt{\hrule width4pt\vfill\hrule}\vrule}} \def\cqfd{\hfill\unskip\kern 6pt\penalty 500\qed\par} \def\tvi{\vrule height 12pt depth 5pt width 0pt} \def\hfq{\hfill\quad} \def\cc #1{\hfq #1\hfq} \def\tv{\tvi\vrule} \def\tvj{\vrule height 12pt depth 5pt width 1pt} \def\tw{\tvj\vrule} \def\traithorizontal{\noalign{\hrule}} \def\traithorizontale{\noalign{\hrule height 1pt}} \catcode`\@=11 \def\Eqalign#1{\null\,\vcenter{\openup\jot\m@th\ialign{ \strut\hfil$\displaystyle{##}$&$\displaystyle{{}##}$\hfil &&\quad\strut\hfil$\displaystyle{##}$&$\displaystyle{{}##}$ \hfil\crcr #1\crcr}}\,} \catcode`\@=12 \newcommand{\vecteur}[1] {\overrightarrow{#1}} \newcommand{\guig}[1] { \begin{guillemets} {#1} \end{guillemets} } \font\tenbb=msbm10 \font\sevenbb=msbm7 \font\fivebb=msbm5 \newfam\bbfam \textfont\bbfam=\tenbb \scriptfont\bbfam=\sevenbb \scriptscriptfont\bbfam=\fivebb \def\bb{\fam\bbfam\tenbb} \let\oldbb=\bb \def\bb #1{{\oldbb #1}}