2. Zhao Shuang: Zhao Shuang, also known as Ying, is a mathematician in China.
3. Wu people from the end of the Eastern Han Dynasty to the Three Kingdoms period.
He is a famous mathematician and astronomer in the history of our country.
5. His main contribution is that he studied Zhou Zhuan in depth around 222, which is the oldest astronomical work in China. In the early Tang Dynasty, it was renamed Zhou Chuan Shu Jing, and the preface should have been written with detailed comments.
6. Zhen Luan: the word Zun Shu, a promise person, a mathematician in the Northern Zhou Dynasty, a captain in the official department, and a satrap in Hanzhong.
7. Believing in Buddhism, he is good at actuarial calculations and calendars, and has been adopted and promulgated since the first year of Tianhe.
8. He annotated many ancient books and wrote five classics arithmetic.
9. There is also a volume of Sunday and Calendar and two volumes of Seven Obsidian Arithmetic.