One principle they adopted at that time was that two solids located between two parallel planes were cut by any plane parallel to these two planes. If the areas of these two parts are always equal, then the volumes of these two solids are also equal.
In order to commemorate the great contribution of grandfather and son to the discovery of this principle, it is also called the "ancestor principle" in mathematics. The principle of ancestral graves is also the principle of equal product.
In astronomy, Zuxuan also inherited his father's footsteps. He wrote 30 volumes of astronomical records and 1 volume of astronomical records, but these books have been lost.
Zu Chongzhi's "Da Li Ming" was revised in the early years of Tian Jian Prison in Liang Wudi and officially passed. He also made a punctual broken kettle wine, which was very accurate, and wrote a "Missing Classics".