Ajima Naonobu

Ajima Naonobu

Ajima Naonobu (安島 直円?, 1732 – May 20, 1798), also known as Ajima Chokuyen, was a Japanese mathematician of the Edo period.[1]

Ajima is credited with introducing calculus into Japanese mathematics. This significance of this innovaction is not diminished by a likelihood that he had access to European writings on the subject.[2] Ajima also posed the question of inscribing three mutually tangent circles in a triangle;[3] 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.[4][5]

Ajima was an astronomer at the Shogun's Observatory (Bakufu Temmongaki).[6]

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.[7]

Contents

Selected works

In a statistical overview derived from writings by and about Ajima Naonobu, OCLC/WorldCat encompasses roughly 20+ works in 30+ publications in 2 languages and 40+ library holdings.[8]

  • Ajima Naonobu zenshū (安島直円全集?) "017232052" OCLC 017232052, collected works
  • Sanpō kosō (算法考艸?) OCLC 22057185881, algorithms considered
  • Jujireki bimmo (Introduction of the 'Works and Days Calendar')[6]
  • Anshi seiyo-reki koso (Ajima's Studies for Western Calendars)[6]
  • Ajima sensei bimmo do jutsu (Methods of Professor Ajima's 'bimmo' )[6]
  • Koshoku mokyu zokkai (Introduction of Eclipses of the Sun and the Moon)[9]
  • Sansha San'en Jutsu (Methods of Three Diagonals and Three Circles)[10]

See also

Notes

  1. ^ Smith, David. (1914). A History of Japanese Mathematics, pp. 195-205. at Google Books
  2. ^ Restivo, Sal P. (1992). Mathematics in Society and History: Sociological Inquiries, p. 58. at Google Books
  3. ^ Fukagawa, Hidetoshi; Rothman, Tony (2008), Sacred mathematics: Japanese temple geometry, Princeton University Press, p. 79, ISBN 9780691127453, http://books.google.com/books?id=OxKKDCmGDlEC&pg=PA79 .
  4. ^ Weisstein, Eric W., "Ajima-Malfatti Points" from MathWorld..
  5. ^ C. Kimberling, Encyclopedia of Triangle Centers, X(179) and X(180).
  6. ^ a b c d Jochi, Shigeru. (1997). "Ajima Naonobu," Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures, p. 38. at Google Books
  7. ^ United States Geological Survey: Planetary names, Naonobu; Naonobu lunar crater (in Japanese)
  8. ^ WorldCat Identities: 安島直円 1739-1798
  9. ^ Jochi, pp. 38-39. at Google Books
  10. ^ Jochi, p. 39. at Google Books

References


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Ajima Naonobu — Ajima Naonobu, connu également sous le nom de Ajima Chokuyen (en japonais : 安島 直円), né en 1732 et mort le 20 mai 1798, est un mathématicien et astronome japonais de l époque d Edo. Ajima Naonobu développa à partir de l algèbre et de la… …   Wikipédia en Français

  • Ajima Naonobu — (jap. 安島 直円; * 1732; † 14. November 1798), auch Ajima Chokuen (die sino japanische Lesung seines Namens) oder Ajima Chokuyen (veraltet für Chokuen), war ein japanischer Mathematiker des Wasan. Er entwickelte under anderem die Integralrechnung des …   Deutsch Wikipedia

  • Ajima Naonobu — Este artículo está titulado de acuerdo a la onomástica japonesa, en que el apellido precede al nombre. Ajima Naonobu (安島直円, Ajima Naonobu? 1732 – 14 de noviembre de 1798) fue un matemático japonés del período Edo y e …   Wikipedia Español

  • Naonobu Ajima — Ajima Naonobu (jap. 安島 直円; * 1732; † 14. November 1798), auch Ajima Chokuen (die sino japanische Lesung seines Namens) oder Ajima Chokuyen (veraltet für Chokuen), war ein japanischer Mathematiker des Wasan. Er entwickelte under anderem die… …   Deutsch Wikipedia

  • Ajima — Naonobu (jap. 安島 直円; * 1732; † 14. November 1798), auch Ajima Chokuen (die sino japanische Lesung seines Namens) oder Ajima Chokuyen (veraltet für Chokuen), war ein japanischer Mathematiker des Wasan. Er entwickelte under anderem die… …   Deutsch Wikipedia

  • Ajima Chokuen — Ajima Naonobu (jap. 安島 直円; * 1732; † 14. November 1798), auch Ajima Chokuen (die sino japanische Lesung seines Namens) oder Ajima Chokuyen (veraltet für Chokuen), war ein japanischer Mathematiker des Wasan. Er entwickelte under anderem die… …   Deutsch Wikipedia

  • Ajima Chokuyen — Ajima Naonobu (jap. 安島 直円; * 1732; † 14. November 1798), auch Ajima Chokuen (die sino japanische Lesung seines Namens) oder Ajima Chokuyen (veraltet für Chokuen), war ein japanischer Mathematiker des Wasan. Er entwickelte under anderem die… …   Deutsch Wikipedia

  • Naonobu (crater) — Coordinates 4°36′S 57°48′E / 4.6°S 57.8°E / …   Wikipedia

  • Naonobu (cratère) — Naonobu Localisation Astre Lune Coordonnées …   Wikipédia en Français

  • Naonobu (cráter lunar) — Nanobu Cráter lunar …   Wikipedia Español

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”