GEOMETRY GRAVITATIONAL PHYSICS SPACE AND TIME A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site metric Any function d(x, y) that describes the distance between two points. Distance is formally defined as a single number with the following properties: (1) d(x, y) = 0 if and only if x = y; (2) d(x, y) = d(y, x); (3) d(x, y) + d(y, z) > or = d(x, z) (the triangle inequality). The concept of a metric is important in differential geometry. Related categories    • GEOMETRY    • GRAVITATIONAL PHYSICS    • SPACE AND TIME Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP