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-%%
-%% A DANTE-Edition example
-%%
-%% Example 28-02-34 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{201.70511pt}
-\setlength\parindent{0pt}
-
-\usepackage{pstricks-add,pst-func}
-
-\begin{document}
-\begin{pspicture*}(-3,-2.2)(3.5,2.5)
-\psaxes{->}(0,0)(-3,-2)(3.2,2)
-\psplotImp[linewidth=2pt](-5,-2.2)(5,2.4){
- /xqu x dup mul def /yqu y dup mul def
- xqu yqu add dup mul 2 dup
- add 2 mul xqu yqu sub mul sub }
-\rput*(2,1.5){%
- $\left(x^2+y^2\right)^2-8(x^2-y^2)=0$}
-\psplotImp[linewidth=1pt,linecolor=red,
- algebraic](-5,-2.2)(5,2.4){%
- (x^2+y^2)^2-4*(x^2-y^2) }% Lemniskate a=2
-\end{pspicture*}
-\end{document}