(18 10 ~ 1882) mathematician in Qing dynasty. The word uncle ren,no. autumn seam. Haining, Zhejiang. I liked mathematics since I was a child, and then I took an examination of Hangzhou, which was written by Ye Li, a famous mathematician in the Yuan Dynasty. The Round Sea Mirror, on the basis of which you can learn and gain more and more knowledge.

Daoguang asked Chen Huan, a Confucian scholar, for knowledge, but he didn't write the mathematics of Qunjing. Later, he successively wrote Four Elements Solution, Linde Shu Solution, Revealing the Arrow, Solving the Mystery of Wanyuan and Logarithmically Exploring the Source, which became famous in one fell swoop. Xianfeng lived in Shanghai for the first time, and translated the last nine volumes of Geometrical Elements together with the Englishman Wei Lieyali, completing the unfinished business of Xu Guangqi and Matteo Ricci in the late Ming Dynasty. He has also translated many books on western mathematics and natural sciences, such as Generation Generation Generation, Re-learning and Tian Lun, etc. On the occasion of Xian Tong, he successively entered the scene of Jiangsu Governor Xu Youren and Liangjiang Governor Zeng Guofan. He is good at mathematics and is trusted. In the seventh year of Tongzhi (1868), recommended by Governor Guo Songtao, he went to Beijing to teach arithmetic and study in Wentong Museum, and was awarded the positions of doctor of the household department and Zhang Jing, the prime minister's yamen, and was awarded the third-class title. At this point, he died.

Li has cultivated many talents with the basic textbook "Measuring the Round Sea Mirror". He studied ancient and modern times and integrated Chinese and western mathematics. There are thirteen kinds and twenty-four volumes in Zegu Xizhai Arithmetic, in which the discussion on the quadrature of a sharp cone has begun to take the form of integral, and the research results on trigonometric function, logarithmic power series expansion and summation of higher-order arithmetic series are outstanding, reaching a very high level of traditional mathematics in China. After Mei Wending, he became another outstanding representative in the history of mathematics in Qing Dynasty. He translated many books on western science and technology in his life, and introduced the latest achievements of modern science from astronomy to plant cytology to China, making outstanding contributions to the development of modern science.