…Around the same time, Takebe discovered a binomial series with exponent 1/2, and used it to determine the coefficients of each term in the Maclaurin series of (arcsin x ) 2 as the limit of the double series. Takebe recorded this method in a book called Enri Tsutsujutsu or Enri Kōhakujutsu. The infinite series expansion of (arcsin x ) 2 shown by Takebe was rearranged and compiled in Enri Kenkon no Maki (author unknown). … *Some of the terminology explanations that refer to "Enri Tsuzurijutsu" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…同じころ建部は,指数1/2の二項級数を見つけ,これを利用して,二重数列の極限として,(arcsinx)2のマクローリン級数の各項の係数を決定した。建部はこの方法を《円理綴術》あるいは《円理弧背術》という書に記した。建部が示した(arcsinx)2の無限級数展開は整理しなおされて,《円理乾坤之巻》(著者不明)にまとめられた。… ※「《円理綴術》」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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