唐代  (?626 AD)

 Astronomical Algorithm class： 《缉古算经》 Read works of Wang Xiaotong at 百家争鸣

　　Dr. Tang Dynasty count calendar, Birth and Death has no test. Takenori nine (626), the former straight Lang Tai Shi Cheng, and modify the calendar to participate in the work. Xiao-Tong's main contribution in mathematics, his monograph is a "Wanted by the old count." Tangxian Qing Dynasty (656) Imperial College set up a "mathematics" to "10 statement is" to textbooks, out "by Ji-old operator" as one of ten books, and provides up to three years of study this book.
　　In the "Wanted by the old operator", the Xiao-Tong in algebra, geometry be innovative.
　　Geometry problem is that 15 to 20 the Three Kingdoms Zhao Shuang, "Zhou Bi Suan Jing" Pythagorean circle square Legend of the supplement and development. Known condition which is the first 4 issues hook (shares) and the power chord hook (shares) String poor condition after the 2 known issues hook (shares) and shares power chord (hook) solution right triangle, which are pre- were not studied in the first three issues raised by the general formula for the equivalent of embankment product:
　　Than the "Nine Chapters commercial success," chapter will discuss only flat embankment (a = a ', b = b', h = h ') has entered into a step (see Figure general dike-shaped diagram).
　　Algebraic geometry methods listed in general terms WANG Xiao-cubic equation, which is existing in ancient China in the third equation by the first record. Cubic equation for the solution, Xiao-Tong, said: "In addition to the open cube." Estimate, "Nine Chapters less extensive" open cube technique development chapter, "Ji-old operator by" the description of the cubic equation coefficients: solid, square, inexpensive , and Liu Hui-opened corner cube operation is consistent Annotation. The solution pairs of quadratic equations, Xiao-Tong, said: "In addition to the prescribing, income, another prescription," that is attributed to two quadratic equations for the continuous solution, this view is correct.