Encyclopedia > Unit disc

  Article Content

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

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
1985 in literature

... also: 1984 in literature, other events of 1985, 1986 in literature, list of years in literature. Table of contents 1 Events 2 New Books 3 Births 4 Deaths 5 ...