Liu Hui (about 225-295 AD), Zhao Shuang (a native of the State of Wu from the end of the Eastern Han Dynasty to the Three Kingdoms period), Zu Chongzhi (born in 429 AD), Zuxuan (Zu Chongzhi Zi), Shen Kuo (A.D. 103 1 ~ 1095), (a native of the Northern Wei Dynasty).