The Geometry Junkyard

Hyperbolic Geometry

Although Euclidean geometry, in which every line has exactly one parallel through any point, is most familiar to us, many other geometries are possible. Particularly important is hyperbolic geometry, in which infinitely many parallels to a line can go through the same point.

From the Geometry Junkyard, computational and recreational geometry pointers.
Send email if you know of an appropriate page not listed here.
David Eppstein, Theory Group, ICS, UC Irvine.
Semi-automatically filtered from a common source file.