Sōichi Kakeya (掛谷 宗一, Kakeya Sōichi, January 18, 1886 – January 9, 1947) was a Japanese mathematician who worked mainly in mathematical analysis and who posed the Kakeya problem and solved a version of the transportation problem.

[2][3] He received the Imperial Prize of the Japan Academy in 1928, and was elected to the Japan Academy in 1934.

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