Yoshida Mitsuyoshi

Yoshida Mitsuyoshi, also known as Yoshida Kōyū, who lived from 1598 to 8 January 1672, was a Japanese mathematician of the Edo period whose popular and widely disseminated published work made him the best-known writer about mathematics of his lifetime. He was a student of Kambei Mori, also known as Mōri Shigeyoshi, and along with Imamura Chishō and Takahara Kisshu he became known to his contemporaries as one of the Three Arithmeticians. He was the author of the oldest extant Japanese mathematical text, the Jinkōki of 1627, which dealt with soroban arithmetic, including square and cube root operations. Later editions and sequels include the Shinpen Jinkōki of 1659.