Imamura Chisho

Japanese: 今村知商 - いまむらちしょう
Imamura Chisho

Date of birth and death unknown. A mathematician in the early Edo period. Commonly known as Nihei. A native of Komashou, Kawachi Province (Osaka Prefecture). He published Jugairoku (1639), a collection of formulas written in classical Chinese, which is thought to rival Mitsuyoshi Yoshida's Jingoki (1627). Imamura studied mathematics under Shigeyoshi Mori in Kyoto, who was also Mitsuyoshi Yoshida's teacher, but this was at the elementary level. He invented his own formulas related to circles and compiled them into Jugairoku. Mathematics in the early Edo period is represented by "Jinkoki" and "Tateiroku," and these two were the best textbooks until the publication of "Sanpo Ketsugisho" by Isomura Yoshinori. "Tateiroku" was printed in 100 copies in Edo. His disciple Ando Yueki published "Tateiroku Kanasho," an explanation of this book. Imamura summarized the basic problems in the formulas of "Tateiroku" into tanka poems and published "Inki Sanka" (1640). "Jitsugetsukaigo Sanpo" (1642), a study of the calendar, has also been handed down.

[Shimohira Kazuo]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

生没年不詳。江戸初期の数学者。通称は仁兵衛。河内(かわち)国(大阪府)の狛庄の人。吉田光由(みつよし)の『塵劫記(じんごうき)』(1627)に対抗したと思われる、漢文で著された公式集『竪亥録(じゅがいろく)』(1639)を出版した。今村は、吉田光由の師でもある京都の毛利重能(もうりしげよし)に数学を習ったが、それは初歩の段階で、彼は自分自身でくふうして円に関する公式をつくり、それらをまとめて『竪亥録』としたのである。江戸初期の数学は『塵劫記』と『竪亥録』で代表され、礒村吉徳(いそむらよしのり)の『算法闕疑抄(けつぎしょう)』が出版されるまで、この2書が最高の教科書であった。『竪亥録』は江戸で100部印刷された。弟子の安藤有益(ゆうえき)は、この書を解説した『竪亥録仮名抄』を出版した。今村は、『竪亥録』の公式のなかで基本的な問題を短歌にまとめ、『因帰算歌』(1640)を出版している。暦の研究書である『日月会合算法(じつげつかいごうさんぽう)』(1642)も伝わっている。

[下平和夫]

出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例

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