Jugai Roku

Japanese: 竪亥録 - ジュガイロク
Jugai Roku
This work was written by Edo period mathematician Imamura Chisho. It was published in 1639 (Kan'ei 16). It is one of the earliest academic publications on Japanese mathematics.

Source: About Shogakukan Digital Daijisen Information | Legend

Japanese:
江戸時代の数学者、今村知商の著作。寛永16年(1639)刊行。和算の学術的出版物としては最初期のもの。

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