Projective Geometry
In projective geometry, a cylinder is simply a cone whose apex is at infinity.
This is useful in the definition of degenerate conics, which require considering the cylindrical conics.
Read more about this topic: Cylinder (geometry)
Famous quotes containing the word geometry:
“The geometry of landscape and situation seems to create its own systems of time, the sense of a dynamic element which is cinematising the events of the canvas, translating a posture or ceremony into dynamic terms. The greatest movie of the 20th century is the Mona Lisa, just as the greatest novel is Gray’s Anatomy.”
—J.G. (James Graham)