Fujita Sadasuke

, also known as Honda Teiken, was a Japanese mathematician in the Edo period. He is the author of "Seiyō sampō" ("Essence of Mathematics") which was published in 1781.
Sadasuke was the father of Fujita Kagen (1765–1821), who is credited with publishing the first collection of "sangaku" problems.
Selected works.
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