《Dividing the Yen into Small Pieces》 - Katsuen Mitsuritsu Shouhou

Japanese: 《割円密率捷法》 - かつえんみつりつしょうほう
《Dividing the Yen into Small Pieces》 - Katsuen Mitsuritsu Shouhou

...This was introduced by the French Jesuit P. Jartou (Du Tomi), and is an infinite series expansion of pi and trigonometric functions. This expansion was later studied by the Mongolian mathematician Ming Antu (1700?-70) and published under the title "Wai Yen Mi Su Zhi Fa" (1774). This is said to be representative of the mathematical achievements of the Chinese during the Qing Dynasty. ...

*Some of the terminology explanations that refer to "《The Divide Yen Secret Method》" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これはフランス人イエズス会士P.ジャルトゥ(杜徳美)が伝えたもので,円周率や三角関数を無限級数に展開したものである。この展開式はのちにモンゴル人数学者明安図(1700?‐70)によって研究され,《割円密率捷法》(1774)の名で出版された。これは清朝における中国人の数学的業績を代表するものといわれる。…

※「《割円密率捷法》」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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