%% 
%%  Der Mathematiksatz mit LaTeX, 1. Auflage 2009
%% 
%%  Example 3-6-2 on page 29.
%% 
%%  Copyright (C) 2009 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.
%% 

\documentclass[]{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{355.65944pt}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\setcounter{equation}{32}
\renewcommand\theequation{3.\arabic{equation}}
\usepackage[expert,lucidasmallscale]{lucidabr}
\usepackage{esint,array}
\setlength\parindent{0pt}
\StartShownPreambleCommands

\StopShownPreambleCommands
\begin{document}
\[
  \int\mathrm{d}[x]:=\lim_{n\rightarrow\infty}\frac{1}{N}
    \prod_n\left\{\int\limits_{-\infty}^\infty\mathrm{d}x(t_n)\right\}
\]
\end{document}