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Japanese mathematics

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Template:Short description Template:Nihongo 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<ref>Selin, Helaine. (1997). Template:Google books</ref> and employed to distinguish native Japanese mathematical theory from Western mathematics (洋算 yōsan).<ref>Smith, David et al. (1914). Template:Google books</ref>

In the history of mathematics, the development of wasan falls outside the Western realm. 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.

HistoryEdit

Pre-Edo period (552-1600)Edit

Records of mathematics in the early periods of Japanese history are nearly nonexistent. Though it was at this time that a large influx of knowledge from China reached Japan, including that of reading and writing, little sources exist of usage of mathematics within Japan. However, it is suggested that this period saw the use of an exponential numbering system following the law of <math>a^{m}*a^{n} = a^{m + n}</math>.<ref>Smith, Template:Google books</ref>

Edo periodEdit

File:Yoshida Soroban.jpg
The soroban in Yoshida Koyu's Jinkōki (1641 edition)

The Japanese mathematical schema evolved during a period when Japan's people were isolated from European influences, but instead borrowed from ancient mathematical texts written in China, including those from the Yuan dynasty and earlier. The Japanese mathematicians Yoshida Shichibei Kōyū, Imamura Chishō, and Takahara Kisshu are among the earliest known Japanese mathematicians. They came to be known to their contemporaries as "the Three Arithmeticians".<ref name="smith35">Smith, Template:Google books</ref><ref>Campbell, Douglas et al. (1984). Mathematics: People, Problems, Results, p. 48.</ref>

Yoshida was the author of the oldest extant Japanese mathematical text, the 1627 work called Jinkōki. The work dealt with the subject of soroban arithmetic, including square and cube root operations.<ref>Restivo, Sal P. (1984). Template:Google books</ref> 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".<ref>Template:Cite book</ref>

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. However Seki's investigations did not proceed from the same foundations as those used in Newton's studies in Europe.<ref>Smith, Template:Google books</ref>

Mathematicians like Takebe Katahiro played an important role in developing Enri (" circle principle"), an analog to the Western calculus.<ref name="msj_takebe">Mathematical Society of Japan, Takebe Prize</ref> He obtained power series expansion of <math>(\arcsin(x))^2</math> in 1722, 15 years earlier than Euler. He used Richardson extrapolation in 1695, about 200 years earlier than Richardson.<ref>Template:Cite journal</ref> He also computed 41 digits of π, based on polygon approximation and Richardson extrapolation.<ref>Template:Cite journal</ref>

Select mathematiciansEdit

File:Seki Kowa Katsuyo Sampo Bernoulli numbers.png
Replica of Katsuyo Sampo by Seki Takakazu. Page written about Bernoulli number and Binomial coefficient.

The following list encompasses mathematicians whose work was derived from wasan. {{#invoke:Hatnote|hatnote}}{{#ifeq:||}}

See alsoEdit

NotesEdit

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ReferencesEdit

External linksEdit

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