English billiards English billiards English billiards, called simply billiards in the United Kingdom, where it originated, and in many former British colonies such as Australia, is a cue sport that combines the aspects of carom billiards and pocket billiards. Two (originally both white, with one marked e.g. with a black dot, but more recently one white, one yellow) and a red are used. Each player or team uses a different cue ball. It is played on a billiards table with the same dimensions as a snooker table and points are scored for and pocketing the balls. English billiards has also, but less
Dynamical billiards Dynamical billiards A billiard is a dynamical system in which a particle alternates between motion in a straight line and specular reflections from a boundary. When the particle hits the boundary it reflects from it without loss of speed. Billiard dynamical systems are Hamiltonian idealizations of the game of billiards, but where the region contained by the boundary can have shapes other than rectangular and even be multidimensional. Dynamical billiards may also be studied on non-Euclidean geometries; indeed, the very first studies of billiards established their ergodic motion on surfaces of constant negative curvature. The study of billiards which are