\documentclass[12pt]{article}
\usepackage{amssymb,amsmath,amscd,concmath,amsfonts}
\usepackage{color}
\pagestyle{empty}
\begin{document}
\begin{equation*}
\| F(x) - F(y)\| < c \| x - y \| \quad\text{for all $x$, $y$}
\end{equation*}
\end{document}