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\renewcommand{\theequation}{\arabic{section}.\arabic{equation}}
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\def\sec#1{(\ref{sec-#1})}
\def\eqn#1{(\ref{eq:#1})}
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\begin{document}

% Article info
\title[sample]  %
      {Just a Sample\\
	illustrating\\
       equation tags}              

\date{Tuesday, November 18, 1997}
%%\date{\today} 

% Author info
\author{Frank Garvan}
\address{Department of Mathematics \\
         University of Florida  \\
         Gainesville, Florida 32611} 
\email{frank@math.ufl.edu}
\thanks{This research was supported by 
   the Wooloomolloo Philososphy School.}    

% AMS info
\keywords{blah, blah and blah}
\subjclass{Primary: 11P; Secondary: 11F}

% Abstract
\begin{abstract}
A micro paper illustrating not much.
\end{abstract}


\maketitle

%%%\tableofcontents


\section{Introduction}
\label{sec-intro}

	This is the introduction. 
Here is an equation
\begin{equation}
\sum_{n=0}^\infty \frac{q^{n^2}}{(q;q)_n}
=
\prod_{n=1}^\infty \frac{1}{(1-q^{5n-1})(1-q^{5n-4})}.
\label{eq:RR}
\end{equation}  
This is equation \eqn{RR}. We have used the notation given in \eqn{qfact}.

\section{Basic functions}
\label{sec-basfuncs}

We use the notation
\begin{equation}
(a;q)_n = (1-a)(1-aq)\cdots(1-aq^{n-1}).
\label{eq:qfact}
\end{equation}

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\end{document}