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By Michael J Bradley

Deals a portrait of 14th-century Iranian mathematician Ghiyath al-Din Jamshid Mas'ud al-Kashi, who built and more advantageous equipment for approximating numerical values, and brought geometrical equipment for picking out components and volumes of architectural domes, arches, and vaults.

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9999999)L = N or Logarithms Receive International Acclaim Henry Briggs, professor of geometry at London’s Gresham College, immediately recognized the significance of Napier’s concept of logarithms. During his monthlong visits to Napier’s home in 1615 and 1616, the two mathematicians revised the scale of the system of logarithms, making log 1 = 0 and log 10 = 1. This improved system of logarithms, known today as common logarithms or base-10 logarithms, had the additional properties that log(ab) = log a + log b, log = log a – log b, and log(ab) = b log a.

14, edited by Charles C. Gillispie, 18–25. New York: Scribner, 1972. Encyclopedic biography including detailed descriptions of the content of many of his books. O’Connor, J. , and E. F. Robertson. “François Viète,” MacTutor History of Mathematics Archive, University of Saint Andrews. Available online. html. Accessed June 3, 2005. Online biography, from the University of Saint Andrews, Scotland. 3 John Napier (1550–1617) John Napier published the first table of logarithms that simplified the process of computation.

The details surrounding these incidents and personality traits showed that Napier possessed exceptional mental abilities and made ingenious use of logic. In order to capture a flock of doves that had repeatedly eaten the seeds he had planted, he soaked a batch of seeds in alcohol and scattered them across his field. The next morning he gathered dozens of semiconscious birds and held them for ransom until their owner repaid him for the seeds they had eaten. To discover which of his servants had been stealing from him, he required each one to go into a dark room and briefly hold his pet rooster whose feathers he had covered with black soot.

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