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Dullo Surface

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DulloSurface

The name Dullo surface is used by Hauser for the quartic surface

(x^2+y^2+z^2)^2=x^2+y^2.

It is the horn torus with major and minor radii both equal to 1/2. Its only real singular point is the origin, where the two sides of the horn torus meet.

See also

Horn Torus, Quartic Surface

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References

Hauser, H. "Gallery of Singular Algebraic Surfaces: Dullo." https://homepage.univie.ac.at/herwig.hauser/gallery.html.

Cite this as:

Weisstein, Eric W. "Dullo Surface." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/DulloSurface.html

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