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, also known as Wada Yasushi, was a Japanese mathematician in the Edo period. His birth name was Kōyama Naoaki; but he changed his name to Wada Nei, by which he became more widely known.〔Smith, David. (1914). 〕 Wada studied under the patronage of the hereditary 〔Titsingh, Isaac. (1834). 〕 in the court of the emperor.〔Restivo, Sal P. (1992). 〕 Wada became a student of Kusaka Sei, who had been a student of Ajima Chokuyen. Wada extended Ajima Chokuyen's development of an integral calculus within the Enri (, "circle principle") context. He worked on the computation of minimum and maximum values (roughly by equating the first derivative to 0) and gave reasoning and insight to the computation method that was given without explanation by Seki Takakazu about 100 years earlier. He was also the first Japanese mathematician to study roulettes. ==Selected works== Wada's published writings are few.〔( WorldCat Identities ): ( Wada Yasushi 和田寧 1787-1840 )〕 * (OCLC 22035715224 ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wada Nei」の詳細全文を読む スポンサード リンク
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