Japanese mathematics
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Japanese mathematics denotes a distinct kind of mathematics which was developed in Japan during the Edo period. The term wasan, from wa and san, was coined in the 1870s and employed to distinguish nat
The soroban in Yoshida Koyu's Jinkōki (1641 edition)
Seki Takakazu
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Seki Takakazu, also known as Seki Kōwa, was a mathematician, samurai, and Kofu feudal officer of the early Edo period of Japan.
Ink painting of Seki Takakazu, from the Japan Academy archives in Tokyo.
Ink drawing of Seki Takakazu, from the archives of the Ishikawa clan
Replica of Hatsubi Sanpō exhibited in the National Museum of Nature and Science, Tokyo, Japan.
Seki on a 1992 stamp, taken from an Edo era ink drawing