| "Sanpo-shinsho" (New Mathematics), supervised by Hiroshi HASEGAWA, edited by Tanehide CHIBA and published in 1830 (the end of Edo period), explained wasan in detail from the entry level up to the latest findings. |
また、幕末の長谷川寛監修、千葉胤秀編の『算法新書』（1830年）では、初歩から最先端の結果までを丁寧に解説した。 |