[Tex/LaTex] Numbering sections

Question

I want my sections, subsections and subsubsections in revtex to be marked by arabic numbers and 1.1., 1.1.1. etc. Instead I'm having roman numbers and letters. Can somebody help me?

Answer 1

\documentclass{article}

\def\thesection{\Roman{section}}
\def\thesubsection{\Roman{section}.\Roman{subsection}}
\def\thesubsubsection{\Roman{section}.\Roman{subsection}.\Roman{subsubsection}}

\begin{document}
\tableofcontents
\section{aaa}
\subsection{bbb}
\subsubsection{ccc}
\end{document}