What is the content of Shu Shu in Zhouyi?

To paraphrase Baidu Encyclopedia, numerology, as well as writing skills, is the main content of China's ancient mysterious culture. Numerology is characterized by using several lines to calculate formulas; The foundation is Yin-Yang and Five Elements, heavenly stems and earthly branches, Hutuluo, Taixuan Jiazi number and so on. "Shu" means Fang Shu; "Number" refers to luck and mathematics; That is, the mathematical theory of restraint of yin and yang and five elements.

My personal understanding of numbers is:

Shu Shu refers to a branch of the Book of Changes, which is based on the theory of the Book of Changes and contains or contains various characters or symbols such as Yin and Yang, Five Elements, Six Parents and Branches.

To put it bluntly, it is eight characters, six hexagrams, six hexagrams, Taoism, feng shui and so on. They are all sub-disciplines of the Book of Changes, and they are also technical mathematics that we often talk about, because in addition to the five elements (Jin Muhuo, Water, Earth), six relatives, dry branches and other books in the Book of Changes, we also need to use some basic knowledge about whether there are hexagrams in the Book of Changes. Surgical mathematics includes them, but they are different subject systems, such as Eight Characters and Six hexagrams, but they all need the knowledge of surgical mathematics, such as heavenly stems and earthly branches of Yin and Yang and Five Elements.

If modern people can understand it again, arithmetic is similar to mathematics. Accounting, measurement, calculus and function are all sub-disciplines based on mathematics. Can you understand them?

To sum up, Shu Shu refers to all kinds of knowledge with words or symbols such as Yin and Yang, Five Elements, Six Parents and heavenly stems and earthly branches.