\documentclass[10pt,a4paper,onecolumn]{article}
%\documentclass[12pt,a4paper,twocolumn,draft]{article}
\bibliographystyle{unsrturl}
\usepackage{a4wide}
\usepackage{ae,aecompl} %replaces \usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
%\usepackage{times}
\usepackage{amsmath}
%\usepackage{amsthm}
%\usepackage{amsfonts}
%\usepackage{textcomp} % more symbols like \textmu
\usepackage[nice]{nicefrac} % nice fraction symbols in text
\usepackage{pdfsync} % emacs integration
\usepackage{xspace}
%\usepackage{ifpdf}
\usepackage{graphicx}
\usepackage{hyperref}
\newcommand{\comment}[1]{\textsc{#1}}
\newcommand{\ie}{i.\,e.\xspace}
\newcommand{\eg}{e.\,g.\xspace}
\frenchspacing
\DeclareGraphicsExtensions{.png,.pdf,.jpg} % change order of extensions
\graphicspath{{./Bilder-lowres/}}
\DeclareMathOperator*{\opequ}{=}
\DeclareMathOperator*{\opgeq}{\geq}
\DeclareMathOperator*{\opleq}{\leq}
\newcommand{\abs}[1] {\left\lvert #1 \right\rvert}
\newcommand{\ceil}[1] {\left\lceil #1 \right\rceil}
\newcommand{\brac}[1] {\left( #1 \right)}
\sloppy
\begin{document}
...