\def\@chapapp{Chapter}

\renewcommand{\thechapter}{\arabic{chapter}}

\renewcommand{\thesection}{\thechapter.\arabic{section}}

\renewcommand{\thesubsection}{\thesection.\arabic{subsection}}

\renewcommand{\thesubsubsection}{\thesubsection.\arabic{subsubsection}}

%-----------------------------------------------------------------------

% section definition

%-----------------------------------------------------------------------

\def\section{

\@startsection {section}{1}{\z@}

{3.5ex plus 1ex minus .2ex}

{1.7ex plus.2ex}

{\bf}

}

%-----------------------------------------------------------------------

% subsection definition

%-----------------------------------------------------------------------

\def\subsection{

\@startsection {subsection}{2}{\z@}

{3.25ex plus 1ex minus .2ex}

{1.7ex plus.2ex}

% {-1em}

{\bf}

}

%-----------------------------------------------------------------------

% subsubsection definition

%-----------------------------------------------------------------------

\def\subsubsection{

\@startsection {subsubsection}{3}{\z@}

{3.0ex plus 1ex minus .2ex}

{1.7ex plus.2ex}

{\bf}

}

다음과 같이 설정하였는데 subsubsection이 안나와요 

뭐가 잘못된걸까요? 

chapter 4라면

4.1 test %section

4.1.1 test %subsection

이렇게 나오는데 

subsubsection 같은경우 

test 

이렇게만 나오내요.. 

어떤 부분을 수정해야 할까요?