华蘅芳(1833—1902)是清代自学成才的数学家、翻译家和教育家.14岁时,华蘅芳结识了比他大15岁的徐寿.徐寿无意仕途.专心研讨古代科学技术的学问,善于仿造各种器具.他们志同道合,一见如故.徐寿很快就替华蘅芳借到程大位著作的数学书 Hua Yufang (1833–1902) was a mathematician, translator, and educator who had become a self-taught scholar in the Qing Dynasty. When he was 14 years old, Hua Yufang met Xu Shou, who was 15 years older than him. Xu Shou has no intention to pursue official careers and devote himself to the study of ancient science. The knowledge of technology is good at imitating various kinds of appliances. They share the same goals and they see the same thing. Xu Shou soon quickly wrote a math book for Hua Yifang to Cheng Dawei.