Doubly ruled surface
This article defines a property that makes sense for a surface embedded in , viz three-dimensional Euclidean space. The property is invariant under orthogonal transformations and scaling, i.e., under all similarity transformations.
View other such properties
A surface embedded in is said to be doubly ruled if given any point in the surface, there are two distinct lines through the point, that lie completely on the surface.
Further information: Classification of doubly ruled surfaces
|Doubly ruled surface||Equational/implicit description|
|Euclidean plane||(the -plane)|
|circular hyperboloid of one sheet|