On this day, 143 years ago, on December 9, 1882 (October 29, 1882, the lunar calendar), Li Shanlan, a mathematician of the Qing Dynasty in China, passed away. The original name is Xinlan, the word Jingfang, the name is Qiuren, and the other name is Ren Uncle. People from Haining, Zhejiang. Born on December 28, the 15th year of Jiaqing of the Qing Dynasty (January 22, 1811); died in Beijing on October 29, the 8th year of Guangxu (December 9, 1882). I loved mathematics since I was a child. Later, I took the test for Hangzhou as a student. I got "Measuring the Round Sea Mirror" written by the famous mathematician Li Ye of the Yuan Dynasty. Based on it, my attainments deepened day by day. During the Daoguang period, he successively wrote "Siyuan Jie","Linde Shu Jie","Arc Arrow Qi Mi","Wan Yuan Chanyou" and "The Origin of Numbers", which became famous. In the early years of Xianfeng, he lived in Shanghai. From 1852 to 1859, he collaborated with the British sinologist Willie Yali to translate the last nine volumes of Euclid's "Geometric Original" at the Mohai Library in Shanghai, completing the unfinished business of Xu Guangqi and Matteo Ricci at the end of the Ming Dynasty. He has also co-translated many Western mathematics and natural science books such as "Dai Wei Ji Shi Ji","Re Xue","Tan Tian" and others. At the time of Xian Tong, he successively joined Jiangsu Governor Xu Youren and Liangjiang Governor Zeng Guofan. He was proficient in mathematics and was deeply relied upon. In the seventh year of Tongzhi (1868), upon the recommendation of Governor Guo Songzhao, he entered the capital to serve as the chief teacher of mathematics at Tongwen School. He was successively awarded the positions of Doctor of the Ministry of Revenue and Prime Minister Yamen Zhang Jing, with three grades of official rank. He used "Measuring the Round Sea Mirror" as his basic teaching material and cultivated many talents. He learned ancient and modern times and integrated Chinese and Western mathematics in one place. Since 1860, he has participated in scientific and technological activities in the Westernization Movement. From 1868, he served as chief teacher of astronomy and mathematics at Tongwen Museum in Beijing until his death. The main works are all collected in "Zeguxizhai Mathematics", which is in 13 categories and 24 volumes. Among them, the discussion of sharp cone quadrature has begun to take shape in the idea of integration, and the research on power series expansions of trigonometric functions and logarithm, high-order arithmetic series summation and other problems has reached the very high level of traditional mathematics in China. After Mei Wending, he became another outstanding representative in the history of mathematics in the Qing Dynasty. He translated many Western science and technology books throughout his life, introduced the most important knowledge of modern science, from astronomy to the latest achievements of plant cytology, to China, making outstanding contributions to promoting the development of modern science. Comment: In memory of this famous mathematician, astronomer, mechanic and botanist in the Qing Dynasty ~