Japanese mathematics (和算 wasan) denotes a distinct kind of mathematics which was developed in Japan during the Edo period (1603–1867). The term wasan, from wa ("Japanese") and san ("calculation"), was coined in the 1870s and employed to distinguish native Japanese mathematical theory from Western mathematics (洋算 yōsan).
In the history of mathematics, the development of wasan falls outside the Western realms of people, propositions and alternate solutions.[clarification needed] At the beginning of the Meiji period (1868–1912), Japan and its people opened themselves to the West. Japanese scholars adopted Western mathematical technique, and this led to a decline of interest in the ideas used in wasan.
This mathematical schema evolved during a period when Japan's people were isolated from European influences. Kambei Mori is the first Japanese mathematician noted in history. Kambei is known as a teacher of Japanese mathematics; and among his most prominent students were Yoshida Shichibei Kōyū, Imamura Chishō, and Takahara Kisshu. These students came to be known to their contemporaries as "the Three Arithmeticians".
Yoshida was the author of the oldest extant Japanese mathematical text. The 1627 work was named Jinkōki. The work dealt with the subject of soroban arithmetic, including square and cube root operations. Yoshida's book significantly inspired a new generation of mathematicians, and redefined the Japanese perception of educational enlightenment, which was defined in the Seventeen Article Constitution as "the product of earnest meditation".
Seki Takakazu founded enri（円理:circle principles）, a mathematical system with the same purpose as calculus at a similar time to calculus's development in Europe; but Seki's investigations did not proceed from conventionally shared foundations.
The following list encompasses mathematicians whose work was derived from wasan.
- Kambei Mori (early 17th century)
- Yoshida Mitsuyoshi (1598–1672)
- Seki Takakazu (1642–1708)
- Takebe Kenkō (1664–1739)
- Matsunaga Ryohitsu (fl. 1718-1749)
- Kurushima Kinai (d. 1757)
- Arima Raido (1714–1783)
- Fujita Sadasuke (1734-1807)
- Ajima Naonobu (1739–1783)
- Aida Yasuaki (1747–1817)
- Sakabe Kōhan (1759–1824)
- Fujita Kagen (1765–1821)
- Hasegawa Ken (c. 1783-1838)
- Wada Nei (1787–1840)
- Shiraishi Chochu (1796–1862)
- Koide Shuke (1797–1865)
- Omura Isshu (1824–1871)
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- Smith, pp. 91–127., p. 91, at Google Books
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- List of Japanese mathematicians -- Clark University, Dept. of Mathematics and Computer Science
- Fukagawa, Hidetoshi et al. (2008). Sacred Mathematics: Japanese Temple Geometry, p. 24., p. 24, at Google Books
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- Endō Toshisada (1896). History of mathematics in Japan (日本數學史 Dai Nihon sūgakush). Tōkyō: _____. OCLC 122770600
- Fukagawa, Hidetoshi, and Dan Pedoe. (1989). Japanese temple geometry problems = Sangaku. Winnipeg: Charles Babbage. ISBN 9780919611214; OCLC 474564475
- __________ and Dan Pedoe. (1991) How to resolve Japanese temple geometry problems? (日本の幾何ー何題解けますか? Nihon no kika nan dai tokemasu ka) Tōkyō : Mori Kitashuppan. ISBN 9784627015302; OCLC 47500620
- __________ and Tony Rothman. (2008). Sacred Mathematics: Japanese Temple Geometry. Princeton: Princeton University Press. ISBN 069112745X; OCLC 181142099
- Horiuchi, Annick. (1994). Les Mathematiques Japonaises a L'Epoque d'Edo (1600–1868): Une Etude des Travaux de Seki Takakazu (?-1708) et de Takebe Katahiro (1664–1739). Paris: Librairie Philosophique J. Vrin. ISBN 9782711612130; OCLC 318334322
- __________. (1998). "Les mathématiques peuvent-elles n'être que pur divertissement? Une analyse des tablettes votives de mathématiques à l'époque d'Edo." Extrême-Orient, Extrême-Occident, volume 20, pp. 135–156.
- Kobayashi, Tatsuhiko. (2002) "What kind of mathematics and terminology was transmitted into 18th-century Japan from China?", Historia Scientiarum, Vol.12, No.1.
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- David Eugene Smith and Yoshio Mikami. (1914). A History of Japanese Mathematics. Chicago: Open Court Publishing. OCLC 1515528; see online, multi-formatted, full-text book at archive.org
- Japan Academy, Collection of native Japanese mathematics
- JapanMath, Math program focused on Math Fact Fluency and Japanese originated logic games
- Sansu Math, translated Tokyo Shoseki Japanese math curriculum
- Kümmerle, Harald. Bibliography on traditional mathematics in Japan (wasan)