mou he fang gai yu liu zu yuan li
Liu YiThe closed square canopy is a geometrical model established by Liu Hui when he studied the formula of ball’s volume. Its establishment provided the sufficient condition to acquire the formula of ball’s volume finally. On the basis of the closed square canopy that Liu Hui studied;Zu Geng continued doing new exploration;and established the formula of ball’s volume eventually. Their achievement in mathematical research we call Liu-Zu’s principle. Some analyses and researches about it are made in this paper.
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