A disc of unitradius on a plane is called a unit disc. Unless otherwise specified, the unit disc on a Cartesian plane is the unit disc about the origin, the inside of the unit circle. A synonym for ball (in geometry or topology, and in any dimension) is disk (or disc Geometry In metric geometry, a ball is a set containing all points within a specified distance of a given point. ... Unity is oneness. ... RADIUS (Remote Authentication Dial In User Service) is an AAA (authentication, authorization and accounting) protocol for applications such as network access or IP mobility. ... In mathematics, a plane is the fundamental two-dimensional object. ... Cartesian means relating to the French mathematician and philosopher Descartes, who, among other things, worked to merge algebra and Euclidean geometry. ... Illustration of a unit circle. ...
A closed unit disc is the set of points whose distance from the centre is less than or equal to 1. An open unit disc is the set of points whose distance from the centre is less than 1.
With the standard metric, unitdiscs look like circles of radius one, but changing the metric changes also the corresponding set of points and therefore the shape of the discs.
This is version 4 of unitdisc, born on 2006-03-18, modified 2007-04-28.
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