Ajima Naonobu
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Template:Family name hatnote Script error: No such module "Nihongo"., also known as Ajima Manzō Chokuyen, was a Japanese mathematician of the Edo period.[1]
His Dharma name was (祖眞院智算量空居士).[2]
Work
Ajima is credited with introducing calculus into Japanese mathematics. The significance of this innovation is diminished by a likelihood that he had access to European writings on the subject.[3] Ajima also posed the question of inscribing three mutually tangent circles in a triangle;[4] these circles are now known as Malfatti circles after the later work of Gian Francesco Malfatti, but two triangle centers derived from them, the Ajima–Malfatti points, are named after Ajima.[5][6]
Ajima was an astronomer at the Shogun's Observatory (Bakufu Temmongaki).[7]
Legacy
In 1976, the International Astronomical Union (IAU) honored Ajima by identifying a crater on the Moon with his name. Naonobu is a small lunar impact crater located on the eastern Mare Fecunditatis, to the northwest of the prominent crater Langrenus.[8][9]
Selected works
In a statistical overview derived from writings by and about Ajima Naonobu, OCLC/WorldCat encompasses roughly 20+ works in 30+ publications in two languages and 40+ library holdings.[10] Script error: No such module "Hatnote".
- Script error: No such module "Nihongo". OCLC 017232052, collected works
- Script error: No such module "Nihongo". OCLC 057185881, algorithms considered
- Script error: No such module "lang". (Introduction of the 'Works and Days Calendar')[7]
- Script error: No such module "lang". (Ajima's Studies for Western Calendars)[7]
- Script error: No such module "lang". (Methods of Professor Ajima's 'Script error: No such module "lang".')[7]
- Script error: No such module "lang". (Introduction of Eclipses of the Sun and the Moon)[11]
- Script error: No such module "lang". (Methods of Three Diagonals and Three Circles)[12]
- Script error: No such module "lang". (Periods of Decimal Fractions)[1]
See also
- Sangaku, the custom of presenting mathematical problems, carved in wood tablets, to the public in shinto shrines
- Soroban, a Japanese abacus
- Japanese mathematics
Notes
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- ↑ a b Smith, David. (1914). Template:Trim&pg=PA195 A History of Japanese Mathematics, pp. 195-205., p. 195, at Google Books
- ↑ Script error: No such module "citation/CS1".
- ↑ Restivo, Sal P. (1992). Template:Trim&pg=PA58 Mathematics in Society and History: Sociological Inquiries, p. 58. , p. 58, at Google Books
- ↑ Script error: No such module "citation/CS1"..
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- ↑ C. Kimberling, Encyclopedia of Triangle Centers Template:Webarchive, X(179) and X(180).
- ↑ a b c d Jochi, Shigeru. (1997). Template:Trim&pg=PA38 "Ajima Naonobu," Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures, p. 38., p. 38, at Google Books
- ↑ United States Geological Survey: Naonobu Gazetteer of Planetary Nomenclature, International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN)
- ↑ Script error: No such module "citation/CS1".
- ↑ WorldCat Identities Template:Webarchive: 安島直円 1739-1798
- ↑ Jochi, Template:Trim&pg=PA38 pp. 38-39., p. 38, at Google Books
- ↑ Jochi, Template:Trim&pg=PA39 p. 39., p. 39, at Google Books
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References
- Endō Toshisada (1896). Script error: No such module "Nihongo".. Tōkyō: _____. OCLC 122770600
- Oya, Shin'ichi. (1970). "Ajima Naonobu" in Dictionary of Scientific Biography, Vol. 1. New York: Charles Scribner's Sons. Template:ISBN
- Restivo, Sal P. (1992). Mathematics in Society and History: Sociological Inquiries. Dordrecht: Kluwer Academic Publishers. Template:ISBN; OCLC 25709270
- Selin, Helaine. (1997). Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures. Dordrecht: Kluwer/Springer. Template:ISBN; OCLC 186451909
- David Eugene Smith and Yoshio Mikami. (1914). A History of Japanese Mathematics. Chicago: Open Court Publishing. OCLC 1515528 -- note alternate online, full-text copy at archive.org