Zhu Shijie (1249-1314) of the Yuan dynasty was one of the greatest algebraists of traditional China. In his *Suan xue qi yuan* (*Introduction to Mathematical Studies, *or* Primer of Mathematics*) of 1299, he presented his *tianyuan* (celestial) technique of solving algebraic equations. As with many Chinese mathematical classics, the book was lost over time in China; however, it was still known and studied in Korea and Japan. When in the 19th century, the scholar Luo Shilin (1774-1853) resurrected mathematical studies in China, he obtained a Korean copy, which he translated into Chinese for the use of his students. This is a later Chinese copy.

**Figure 1.** Title page and preface of the *Suan xue qi yuan *of Zhu Shijie

**Figure 2. **Example of *tianyuan* method. Note the columns of numerical coefficients. For a more complete description of this technique, see pp. 347-365 of the sourcebook referenced below.

Joseph Dauben. “Chinese Mathematics” in *The Mathematics of Egypt, Mesopotamia*, *China, India and Islam: A Sourcebook* (Victor Katz, ed.). Princeton University Press, 2007.

*Primer of Mathematics,* World Digital Library: http://www.wdl.org/en/item/4721/

The images above were obtained through the courtesy of the World Digital Library (WDL) and the assistance of the digital imaging staff at the United States Library of Congress. All items can be viewed in full at the WDL website.