Yoshida Koyu
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The soroban in Yoshida Mitsuyoshi’s Jinkōki, 1641 edition
Yoshida Mitsuyoshi (吉田 光由? 1598–1672) or Yoshida Kōyū was a Japanese mathematician. He was a student of Mōri Shigeyoshi and the author of the arithmetic book Jinkōki.

