Ye Li (1 192 ~ 1279) was the greatest scientist in the Jin Dynasty and one of the greatest mathematicians in the world at that time. His original name was Li Zhi, but in order to distinguish him from Tang Gaozong and Li Zhi, he dropped a bit in the processing of Chinese characters. Ye Li was from Hebei, and his father was an official in the Jin Dynasty. After taking the imperial examination in Beijing, he was admitted, appointed as a local official in Shaanxi, and later promoted to the local governor of Zhongzhou (Yuxian) in Henan.