, 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 , 1769 , 1781 , 1796 , 1807 See also Sangaku, the custom of presenting mathematical problems, carved in wood tablets, to the public in Shinto shrines Soroban, a Japanese abacus Japanese mathematics Notes References Fukagawa, Hidetoshi and Tony Rothman. (2008). Sacred Mathematics: Japanese Temple Geometry. Princeton: Princeton University Press. ; OCLC 181142099 Nussbaum, Louis-Frédéric and Käthe Roth. (2005). Japan encyclopedia. Cambridge: Harvard University Press. ; OCLC 58053128 David Eugene Smith and Yoshio Mikami. (1914). A History of Japanese Mathematics. Chicago: Open Court Publishing. OCLC 1515528 -- note alternate online, full-text copy at archive.org 18th-century Japanese mathematicians 19th-century Japanese mathematicians Japanese writers of the Edo period 1734 births 1807 deaths