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%% 
%%  An UIT Edition example
%% 
%%  Example 04-05-14 on page 43.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{16}
\renewcommand\theequation{4.\arabic{equation}}
\StartShownPreambleCommands
\usepackage{mathrsfs}
\StopShownPreambleCommands
\begin{document}
\begin{equation}
\mathcal{W} := \left\{ \bigcup^\infty_{j=0} W_j \; \middle| \;
  W_j \subset \tilde P_{*j} \textrm{ open},\; W_j \subset W_{j+1}\right\}
\end{equation}
\end{document}