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
Sangaku
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Sangaku or san gaku are Japanese geometrical problems or theorems on wooden tablets which were placed as offerings at Shinto shrines or Buddhist temples during the Edo period by members of all social
A sangaku dedicated to Konnoh Hachimangu (Shibuya, Tokyo) in 1859.
A sangaku dedicated at Emmanji Temple in Nara