https://www.geogebra.org/haftendorn
Haftendorn, Buch (Springer):
Kurven erkunden und verstehen
Kap 5.2  S. 141
www.kurven-erkunden-und-verstehen.de

Ha 2017

a = 1.1
b = 1.4
n = 1.477 (slider from -5 to 6, step 0.001)
g = false
f(x, y) = (x^(2) * (x - (2 * a))^(2)) + (y^(2) * (y - (2 * b))^(2)) - n
c: (x^(2) * (x - (2 * a))^(2)) + (y^(2) * (y - (2 * b))^(2)) = n
A_1: ((2 * a), (2 * b))
A_2: (0, (2 * b))
A_3: ((2 * a), 0)
A_4: (0, 0)
d: x = a
e: y = b
h: a^(4)
i: a^(4) + b^(4)
k = 3.3
z_1(x, y) = k