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:
“I am present at the sowing of the seed of the world. With a geometry of sunbeams, the soul lays the foundations of nature.”
—Ralph Waldo Emerson (1803–1882)