LaTeX Forum

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\usepackage[ngerman]{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{scrpage2}
\pagestyle{scrheadings}
\usepackage{array}
\usepackage{booktabs}
\automark[section]{chapter}
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\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
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\begin{document}

\begin{gather}
			\begin{split} \intop_0^{\infty}{\intop_{-\infty}^{\infty}{\intop_{-\infty}^{\infty}{\intop_{-\infty}^{\infty}{\intop_0^1{\ldots \intop_0^1{\intop_0^{\infty}{P\left( \rho,u_1,u_2,u_3,Y_1,\ldots, Y_{N_r-1},T;\vec{x}\right)\\ \,d\rho\, du_1\, du_2\, du_3\, dY_1, \ldots,dY_{N_r-1}\,dT}}}}}}}=1
	\label{eq:pdf_normalization}
	\end{split}
\end{gather}

\end{document}

\intop_0^\infty

\documentclass[pdftex,a4paper,oneside,bibtotoc,liststotoc,halfparskip,headsepline,12pt]{scrbook} 

\usepackage[ngerman]{babel} 
\usepackage[latin1]{inputenc} 
\usepackage[T1]{fontenc} 
\usepackage{scrpage2} 
\pagestyle{scrheadings} 
\usepackage{array} 
\usepackage{booktabs} 
\automark[section]{chapter} 
\chead{} 
\usepackage{amsmath} 
\usepackage{amsfonts} 
\usepackage{amssymb} 
\usepackage[babel,german=quotes]{csquotes} 
\renewcommand{\arraystretch}{1.5} 

\begin{document} 

\begin{multline}
  \label{eq:pdf_normalization}
  \int_0^\infty
  \int_{-\infty}^\infty \int_{-\infty}^\infty \int_{-\infty}^\infty
  \int_0^1 \dotsi \int_0^1
  \int_0^\infty
  P ( \rho, u_1, u_2, u_3, Y_1, \dots, Y_{N_r-1}, T; \vec x ) \\
  d \rho
  \, du_1 \, du_2 \, du_3
  \, dY_1, \dots, dY_{N_r-1}
  \, dT
  = 1 
\end{multline} 

\end{document}