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Descripción: Superficie dada en forma implícita por:
a F + q = 0
con:
F=h1h2h3h4h5,
h1 = x - z,
h2 = Cos(2p /5) x - Sin(2p
/5) y - z,
h3 = Cos(4p /5) x - Sin(4p
/5) y - z,
h4 = Cos(6p /5) x - Sin(6p
/5) y - z,
h5 = Cos(8p /5) x - Sin(8p
/5) y - z,
q = (1-c z)(x2 + y2 - 1+ r z2)2 ,
r = (1+3 Sqrt(5))/4,
a = -(8/5) (1 + 1/Sqrt(5)) Sqrt(5-Sqrt(5)),
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