Along with his son, Zu Geng, Zu Chongzhi applied the Cavalieri's principle to find an accurate solution for calculating the volume of the sphere. Besides containing formulas for the volume of the sphere, his book also included formulas of cubic equations and the accurate value of pi. His work, "Zhui Shu" was discarded out of the syllabus of mathematics during the Song dynasty and lost. Many believed that "Zhui Shu" contains the formulas and methods for linear, matrix algebra, algorithm for calculating the value of "π", formula for the volume of the sphere. The text should also associate with his astronomical methods of interpolation, which would contain knowledge, similar to our modern mathematics.