\documentclass[preview]{standalone}
\usepackage{varwidth}
\usepackage[utf8x]{inputenc}
\usepackage{amsmath, amssymb, graphics, setspace}

\begin{document}
\begin{varwidth}{50in}
  \begin{equation}
    || \vec{F} ||_{inf} 
    = {\rm max}\left(|F_1^1|, |F_1^2|, |F_1^3| \cdots, 
    |F_N^1|, |F_N^2|, |F_N^3|\right)
    \nonumber
  \end{equation}
\end{varwidth}
\end{document}
