I used subsubsection in latex doesn't work.
For example:
\ chapter{a}
\ section{b}
\ subsection{c}
\ subsubsection{d}
it should display like this:
1. a
1.1 b
1.1.1 c
1.1.1.1 d
but it displays as following:
1. a
1.1 b
1.1.1 c
d
anybody has an idea? Thank you