A surface that contains two families of rulings. The only three doubly ruled surfaces are the plane, hyperbolic paraboloid, and single-sheeted hyperboloid.
Doubly Ruled Surface
See also
Hyperbolic Paraboloid, Hyperboloid, Plane, Ruled SurfaceExplore with Wolfram|Alpha
References
Hilbert, D. and Cohn-Vossen, S. Geometry and the Imagination. New York: Chelsea, p. 15, 1999.Referenced on Wolfram|Alpha
Doubly Ruled SurfaceCite this as:
Weisstein, Eric W. "Doubly Ruled Surface." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/DoublyRuledSurface.html