Zu Geng

Zu Geng (祖暅) was a Chinese mathematician who lived from c. 450 to c. 520. He was the son of another famous Chinese mathematician, Zu Chongzhi (祖沖之). He discovered the "Zu Geng's Principle", stating that "The volumes of two solids of the same height are equal if the areas of the plane sections at equal heights are the same." This is same as Cavalieri's principle, but was discovered about 1100 years earlier.

References

*Zu Geng at MacTutor