Yasushi Wada

Japanese: 和田寧 - わだやすし

Born: Tenmei 7 (1787)
[Died] Tempo 11 (1840)
A mathematician who ushered in the heyday of Japanese mathematics during the Bunka and Bunsei eras. Commonly known as Toyonoshin, his pen name was Shiei, and his pen names included Sangaku, Ensho, and Hotsu. He became a student of Kusaka Makoto, and together with fellow student Uchida Gokan, he completed the sixth transmission of the Seki school. He is considered the second greatest mathematician of the Edo period after Seki Takakazu, and is the perfector of the art of enri katsujutsu (the art of the circle). Wada started by discussing the basics of the circle, expanded the scope of application of Ajima Naoen's double integral method, and created various tables related to the circle. Since the circle theory of Japanese mathematics mainly uses series, there was a need for tables related to the development of the art of the circle theory using infinite series. He wrote many books on integer theory, but his books and tables on the circle theory of series include the following: Rokuyo sanpo (Six-contract arithmetic), Da-hyo zensho (Complete collection of tables), Shosa henkyu sanpo (Sample of calculations of differences and differences in the analysis of the circle theory), Enri sho kan (First volume of tables of the circle theory), Junsei henpo hyo ho (Table of the rate of succession and the table of the eight states of the rate of succession), etc. It is said that he had 170 students.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

[生]天明7(1787)
[没]天保11(1840)
文化文政期における和算の最盛期を開いた数学者。通称豊之進，字は子永，号は算学，円象，豁通など。日下誠の門下生となり，同門の内田五観とともに，関流宗統6伝についた。関孝和に次ぐ江戸時代の大数学者とされ，円理豁術 (かつじゅつ) の完成者である。和田は円理の基礎から論じて，安島直円による二重積分の方法の応用範囲を拡大し，円理に関する諸表をつくった。和算の円理はもっぱら級数を利用するため，無限級数を用いた円理綴術の展開に関する諸表が必要であった。整数術に関する著書も多いが，級数円理に関する著書および表には次のようなものがある。『六約算法』『だ表全書』『招差偏究算法』『円理諸表首巻』『順生率変歩表』『応率八態表』など。門下生は 170人を数えたという。

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