Book:Yang Hui/Xiangjie Jiuzhang Suanfa/Historical Note

Historical Note on
contains the first extant instance of Yang Hui's triangle, now known in the West as Pascal's Triangle.

The author acknowledged that his method of finding square roots and cube roots using Yang Hui's Triangle was invented by mathematician  who expounded it around $1050$ CE, about $500$ years before.

However, that work of is now lost.