永乐大典
In 1773, the Qianlong Emperor decided to compile "Siku Quanshu" (The Complete Library of the Four Treasuries). Dai Zhen (1724-1777) selected and proofread "The Nine Chapters on the Mathematical Art" from "Yongle Encyclopedia" and several other mathematical works from Han and Tang dynasties. The long-missing mathematical works from Song and Yuan dynasties such as "Si-yüan yü-jian" and "Ceyuan haijing" were also found and printed, which directly led to a wave of new research. The most annotated work were "Jiuzhang suanshu xicaotushuo" (The Illustrations of Calculation Process for "The Nine Chapters on the Mathematical Art" ) contributed by Li Huang and Siyuan yujian xicao (The Detailed Explanation of Si-yuan yu-jian) by Luo Shilin.