%\renewcommand{\thechapter}{\Roman{chapter}} %pour la thèse juste.
\renewcommand{\thefootnote}{\roman{footnote}}
\renewcommand{\theenumi}{\textbf{\roman{enumi}}} 

\makeatletter
%\renewcommand\theequation{\thesection.\textbf{\alph{equation}}}
\renewcommand\theequation{\thesubsection.\textbf{\alph{equation}}}
%\renewcommand\theequation{\thesubsection.\roman{equation}}
\@addtoreset{equation}{subsection}
\makeatother

\renewcommand\thesubsubsection{\textbf{\thesubsection.\arabic{subsubsection}}} %met en gras les références mais pas le numéro.
\renewcommand\thesubsection{\textbf{\thesection.\arabic{subsection}}}

%\renewcommand\theparagraph{\textbf{\thesubsubsection.\alph{paragraph}}} 
%\renewcommand\theparagraph{\textbf{\thesubsubsection.\roman{paragraph}}}
\renewcommand\theparagraph{\textbf{\thesubsubsection.\arabic{paragraph}}}
\ifx\danslelivre\undefined
\else
\renewcommand\thechapter {\Roman{chapter}}
\fi
\newenvironment{facultatif}{\bgroup\footnotesize}{\egroup}

\setcounter{tocdepth}{2}