LaTeX Forum

\documentclass[12pt,a4paper]{scrartcl}
\usepackage[utf8x]{inputenc}
\usepackage[german]{babel}
\usepackage[T1]{fontenc}	
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage[breaklinks]{hyperref} 

\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}
\author{Ich}
\subject{blabla} 
\titlehead{beispiel}







\begin{align*}
\frac{dN_{1}}{dt}&=r_{1}  N_{1} + a_{1}  N_{1}  N_{2},          &  \frac{dN_{2}}{dt} &=r_{2}  N_{2} + a_{2}  N_{2}  N_{1}     & {&} &  N_{1}, N_{2}&= \text{Populationsdichten}\\
{&}   &  {&}   &  {&} & r_{1}, r_{2}&=\text{intrinsische Wachstumskonstanten} \\
{&}   &  {&}   & {&}   &  a_{1},a_{2}&=\text{positive Kontanten} \\
\end{align*}

\documentclass[12pt,a4paper]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage[german]{babel}
\usepackage[T1]{fontenc}  
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}

\begin{document}

\begin{align*}
	\frac{dN_{1}}{dt}&=r_{1}  N_{1} + a_{1}  N_{1}  N_{2},\\
	\frac{dN_{2}}{dt} &=r_{2}  N_{2} + a_{2}  N_{2}
	N_{1}\\
	N_{1}, N_{2} &= \text{Populationsdichten}\\
	r_{1}, r_{2}&=\text{intrinsische Wachstumskonstanten} \\
	a_{1},a_{2}&=\text{positive Kontanten} \\
\end{align*}

 
\end{document}