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Unit disc

A disc of unit radius 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 unit disc may be either closed or open, that is to say, either be
  • closed: the set of points with radius less than or equal to one from the centre
  • open: the set of points with radius less than one from the centre

See also: open interval, closed interval, open set, closed set

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