| dbo:abstract |
Sakabe Kōhan (坂部 廣胖), 1759 – 16 septembre 1824, est un mathématicien japonais de l'époque d'Edo. (fr) Sakabe Kōhan (坂部 廣胖, 1759 – September 16, 1824) was a Japanese mathematician in the Edo period. Sakabe served for a time in the Fire Department of the shogunate, but he resigned that position to become a rōnin or masterless samurai. He spent the rest of this life in study, in teaching, and in promoting mathematics education in Japan. Sakabe was a student of Ajima Naonobu. Sakabe investigated some European and Chinese works which had appeared in Japan, but his general method was later construed to be innovative, clarified and thus improved. Foreign influence shows itself indirectly some of his published work. Sakabe's Sampo Tenzan Shinan-roku (Treatise on Tenzan Algebra) in 1810 was the first published work in Japan proposing the use of logarithmic tables. He explained that "these tables save much labor, [but] they are but little known for the reason that they have never been printed in our country." Sakabe's proposal would not be realized until twenty years after his death when the first extensive logarithmic table was published in 1844 by Koide Shuke. In Sakabe's Treatise on Tenzan Algebra, mathematical problems are arranged in order from easy problems to difficult ones. The text presents a method for finding the length of a circumference and the length an arc of an ellipse. This was the first appearance of the problems pertaining to ellipses in printed books in Japan. (en) 坂部 広胖（さかべ こうはん（ひろなお）、宝暦9年（1759年） - 文政7年8月24日（1824年9月16日））は江戸時代中期の和算家。旧姓は戸田氏で坂部姓を経て戸田姓に復する。字は子顕。仮名は勇左衛門。号は中嶽、澗水、また晩成堂。 (ja) |
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http://www.worldcat.org/title/dai-nihon-sugakushi-history-of-mathematics-in-japan-by-endo-toshisada/oclc/122770600&referer=brief_results http://www.worldcat.org/title/history-of-japanese-mathematics/oclc/1515528 https://archive.org/details/historyofjapanes00smitiala https://books.google.com/books%3Fid=J1YNAAAAYAAJ&dq=Shiraishi+Chochu&source=gbs_navlinks_s http://www.worldcat.org/search%3Fq=no:%22057236896%22 http://www.worldcat.org/search%3Fq=no:%22122810576%22 http://www.worldcat.org/title/nieuw-archief-voor-wiskunde/oclc/5814818 |
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Sakabe Kōhan (坂部 廣胖), 1759 – 16 septembre 1824, est un mathématicien japonais de l'époque d'Edo. (fr) 坂部 広胖（さかべ こうはん（ひろなお）、宝暦9年（1759年） - 文政7年8月24日（1824年9月16日））は江戸時代中期の和算家。旧姓は戸田氏で坂部姓を経て戸田姓に復する。字は子顕。仮名は勇左衛門。号は中嶽、澗水、また晩成堂。 (ja) Sakabe Kōhan (坂部 廣胖, 1759 – September 16, 1824) was a Japanese mathematician in the Edo period. Sakabe served for a time in the Fire Department of the shogunate, but he resigned that position to become a rōnin or masterless samurai. He spent the rest of this life in study, in teaching, and in promoting mathematics education in Japan. Sakabe was a student of Ajima Naonobu. (en) |
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Sakabe Kōhan (fr) 坂部広胖 (ja) Sakabe Kōhan (en) |
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