Alderson disk
An Alderson disk named after Dan Alderson its originator is an artificial astronomical megastructure like Niven's Ringworld or a Dyson sphere. The disk is a giant platter like a CD or phonograph record. The sun rests in the hole at the center of ..
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Andy Hertzfeld
Andy Hertzfeld born April 6 1953 was a key member of the original Apple Macintosh development team during the 1980s. After buying an Apple II in January 1978 he went to work for Apple Computer from August 1979 until March 1984 where he was a key ..
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Annulus (mathematics)
An annulus In mathematics an annulus the Latin word for "little ring" with plural annuli is a ring shaped geometric figure or more generally a term used to name a ring shaped object. The adjective form is annular for example an annular eclipse. T..
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Area of a disk
The area of a disk the region inside a circle is πr2 when the circle has radius r. Here the symbol π Greek letter pi denotes as usual the constant ratio of the circumference of a circle to its diameter. Modern mathematics can obtain the area usin..
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Disk (mathematics)
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. In geometry a disk also spelt disc is the regi..
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Disk covering problem
The disk covering problem was proposed by Zahn in 1962. Given an integer n the problem asks for the smallest real number rn such that n disks of radius rn can be arranged in such a way as to cover the unit disk. <pXXX CBR XX..
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Unit disk
In mathematics the open unit disk around P where P is a given point in the plane is the set of points whose distance from P is less than 1: . The closed unit disk around P is the set of points whose distance from P is less than or equal to one: ..
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Unit disk graph
A collection of unit circles and the corresponding 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..
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