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History
Richard Hamming
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Richard Wesley Hamming was an American mathematician whose work had many implications for computer engineering and telecommunications. His contributions include the Hamming code, the Hamming window, Hamming numbers, sphere-packing, Hamming graph concepts, and the Hamming distance.
Richard Hamming
Richard Hamming
A two-dimensional visualisation of the Hamming distance. The color of each pixel indicates the Hamming distance between the binary representations of
A two-dimensional visualisation of the Hamming distance. The color of each pixel indicates the Hamming distance between the binary representations of its x and y coordinates, modulo 16, in the 16-color system.
Regular number
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Regular numbers are numbers that evenly divide powers of 60 (or, equivalently, powers of 30). Equivalently, they are the numbers whose only prime divisors are 2, 3, and 5. As an example, 602 = 3600 = 48 × 75, so as divisors of a power of 60 both 48 and 75 are regular.
AO 6456, a table of reciprocals of regular numbers from Seleucid Uruk, copied from an unknown earlier source
AO 6456, a table of reciprocals of regular numbers from Seleucid Uruk, copied from an unknown earlier source