unit disk

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• Unit disk — For other uses, see Disc (disambiguation). An open Euclidean unit disk In mathematics, the open unit disk (or disc) around P (where P is a given point in the plane), is the set of points whose distance from P is less than 1 …   Wikipedia

• Unit disk graph — In geometric graph theory, a unit disk graph is the intersection graph of a family of unit circles in the Euclidean plane. That is, we form a vertex for each circle, and connect two vertices by an edge whenever the corresponding circles cross… …   Wikipedia

• Disk (mathematics) — For other uses, see Disc (disambiguation). A disk is the region bounded by a circle. An open disk is the interior of the disk excluding the bounding circle, while a closed disk (see closed set) is the open disk together with the bounding circle.… …   Wikipedia

• Disk algebra — For other uses, see Disc (disambiguation). In function theory, the disk algebra A(D) (also spelled disc algebra) is the set of holomorphic functions f : D → C, where D is the open unit disk in the complex plane C, f extends to a continuous… …   Wikipedia

• Unit sphere — some unit spheres In mathematics, a unit sphere is the set of points of distance 1 from a fixed central point, where a generalized concept of distance may be used; a closed unit ball is the set of points of distance less than or equal to 1 from a …   Wikipedia

• Unit distance graph — In mathematics, and particularly geometric graph theory, a unit distance graph is a graph formed from a collection of points in the Euclidean plane by connecting two points by an edge whenever the distance between the two points is exactly one.… …   Wikipedia

• Disk covering problem — The disk covering problem was proposed by C. T. Zahn in 1962. Given an integer n, the problem asks for the smallest real number r(n) such that n disks of radius r(n) can be arranged in such a way as to cover the unit disk. The best solutions to… …   Wikipedia

• Disk storage — or disc storage is a general category of storage mechanisms, in which data are digitally recorded by various electronic, magnetic, optical, or mechanical methods on a surface layer deposited of one or more planar, round and rotating disks (or… …   Wikipedia

• Disk II — drives. The Disk II Floppy Disk Subsystem was a 5¼ inch floppy disk drive designed by Steve Wozniak and manufactured by Apple Computer. It was first introduced in 1978 at a retail price of US$495 for pre order; it was later sold for $595… …   Wikipedia

• Disk encryption theory — Disk encryption is a special case of data at rest protection when the storage media is a sector addressable device (e.g., a hard disk). This article presents cryptographic aspects of the problem. For discussion of different software packages and… …   Wikipedia

• Disk Wars — is a collectible fantasy tabletop miniature wargame designed primarily by Tom Jolly and Christian T. Petersen and first published in 1999 by Fantasy Flight Games. The game takes its name from its atypical use of cardboard disks to represent… …   Wikipedia