Japanese mathematician Guan Xiaohe (about1642-1708) is the representative work of differential algorithm. Born into a samurai family, he studied mathematics under Gao Qiao Yoshiko, and later served as a vassal of the aristocratic family in Edo, in charge of wealth and taxes. 1706 resigned. He is the founder of Japanese classical mathematics (sum calculation) and management school, and is honored as a saint in Japan.