Shen, Kangshen Analysis on Shushu Jiuzhang to its propositions about theory of numbers. (Chinese. English summary) Zbl 0623.01002 J. Hangzhou Univ., Nat. Sci. Ed. 13, 421-434 (1986). “Shushu Jiuzhang” was written by the famous Chinese mathematician Qin Jiushao in 1247. The book contains 81 problems. Ten problems deal with congruence expressions which were called “Da Yuan method”. The author analyzes the Da Yuan method of Qin Jiushao by modern Number Theory and shows that Qin’s works are identical with certain works of L. Euler, J. L. C. Lagrange and C. F. Gauss. Reviewer: Li Xiang MSC: 01A25 History of Chinese mathematics 11-03 History of number theory Keywords:congruence expression; number theory; L. Euler; J. L. C. Lagrange; C. F. Gauss Biographic References: Qin, Jiushao PDFBibTeX XMLCite \textit{K. Shen}, J. Hangzhou Univ., Nat. Sci. Ed. 13, 421--434 (1986; Zbl 0623.01002)