Zu Geng (mathematician)
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Zu Geng (traditional Chinese: 祖暅; simplified Chinese: 祖暅; pinyin: Zǔ Gèng; Wade-Giles: Tsu Keng, fl. 5th century), courtesy name Jing Shuo (景烁), was a Chinese mathematician. He was the son of another famous Chinese mathematician, Zu Chongzhi. 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.
He is credited with the invention of the astronomical sighting tube, which Shen Kuo and Wei Pu would later improve during the 11th century.
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