Fujita Sadasuke (藤田 定資 , December 12, 1734 - September 9, 1807), also known as Honda Teiken,[1] was a Japanese mathematician in the Edo period.[2] He is the author of Seiyō sampō (Essence of Mathematics) which was published in 1781.[3]
Sadasuke was the father of Fujita Kagen (1765–1821),[4] who is credited with publishing the first collection of sangaku problems.[2]
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In a statistical overview derived from writings by and about Fujita Sadasuke, OCLC/WorldCat encompasses roughly 30 works in 30+ publications in 1 language and 30+ library holdings[5]