| In the latter half of the 17th century, sangaku puzzles were collected and compiled as mathematical books and the first one among those published as books is said to be "Shinpeki Sanpo" (Perfect Mathematics or Mathematics on God's wall) of the year 1789, which was edited by Sadasuke FUJITA. |
17世紀後半には算額に書かれた問題を集めて数学書にするものも現れ、出版物としての算額集の最初は寛政元年（1789年）藤田貞資『神壁算法』とされる。 |