Double Sphere
The double sphere is the degenerate quartic surface
| (x^2+y^2+z^2-r^2)^2=0 |
obtained by squaring the left-hand side of the equation of a usual sphere
| x^2+y^2+z^2-r^2=0. |
See also
Double Bubble, SphereExplore with Wolfram|Alpha
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Cite this as:
Weisstein, Eric W. "Double Sphere." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/DoubleSphere.html