Li Ye (mathematician)

Li Ye (Chinese: 李冶; Wade–Giles: Li Yeh; 1192–1279), born Li Zhi (Chinese: 李治), courtesy name Li Jingzhai (Chinese: 李敬斋),[1][2] was a Chinese scientist and writer who published and improved the tian yuan shu method for solving polynomial equations of one variable.[1][3][4][5][6][7] Along with the 4th-century Chinese astronomer Yu Xi, Li Ye proposed the idea of a spherical Earth instead of a flat one before the advances of European science in the 17th century.