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Enneper surface
By tca
Enneper (1864) surface is a self-intersecting surface that can be described parametrically by (https://en.wikipedia.org/wiki/Enneper_surface):
x=u(1-u.^2/3+v^2)/3
y=-v(1-v^2/3+u^2)/3
z=(u^2-v^2)/3
(u,v) in R^2
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