%% 
%%  A DANTE-Edition example
%% 
%%  Example 28-02-36 on page 547.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{225.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks-add,pst-func}

\begin{document}
\begin{pspicture*}(-3,-3.2)(3.5,3.5)
\psaxes{->}(0,0)(-3,-3)(3.2,3)
\psplotImp[linewidth=2pt,
  linecolor=green](-6,-6)(4,2.4){
    x 3 exp y 3 exp add
    4 x y mul mul sub }
\uput*[45](-2.5,2){%
  $\left(x^3+y^3\right)-4xy=0$}
\end{pspicture*}
\end{document}