Yang Hui was an outstanding mathematician in the Southern Song Dynasty. He is the first mathematician in the world to draw a rich vertical and horizontal map and discuss its composition law. In addition to this achievement, there is also a major contribution, that is, the "Yang Hui Triangle". With Qin? Ye Li? Zhu Shijie is also known as the "Four Masters of Mathematics in Song and Yuan Dynasties".

Yang Hui is also a math educator. He attaches great importance to the popularization and development of mathematics education. In the book The Origin of Algorithm Change, he formulated the Learning Program for beginners, which is an important document in the history of ancient mathematics education in China.

Detailed explanation of the nine-chapter algorithm