What book is Hutuluo? What is the magical "double period phenomenon"?

Heluo Book has been circulated in China since ancient times. These two pairs of mysterious patterns, which seem to have nothing to do with each other, but essentially contain the principle of heaven and earth, are regarded as one of the sources of Chinese civilization. Both these pictures contain strange mathematical knowledge. If we understand the mystery, we will find that they are linked by a link. If we solve them, we will find that we have finally returned to the starting point. According to legend? River map? It's a gossip painting made by Fuxi in ancient times. ? Uncle Luo? It's a turtle shell that climbed up from Luohe, and the pattern on it was seen by Dayu, and it was made into nine domains of Hongfan.

When most people see this book, they think it is gobang or some black and white dots with no rules to follow. Essentially, these black and white dots represent odd and even numbers respectively, which are also called positive numbers and factors. This picture has been handed down since ancient times. If these black and white dots are used to represent it, you can get a nine-square grid. If you put odd numbers on the periphery and even numbers on the inner circle, it can become another very strange pattern.

This graph has its own law of multiplication of peripheral cardinality. The peripheral number is multiplied clockwise by one week, and finally returns to three, and so on. The three numbers of three, seven and nine go back and forth, which is the phenomenon of multiplication cycle. The same phenomenon will occur if we abandon the hormones in the outer ring and only see the even numbers in the inner ring. The even numbers of the inner circle are two, four, six and eight, and these four numbers will also circulate in the same place, forming a repeated cycle. The position of the center is five, no matter how it is multiplied, it is a multiple of five, which is the same as the original cycle.

As for the river map, it is based on the school of 16 * * * and the same gate of 27, and the river map is also a pattern composed of black and white dots. There are also some mathematical theories, but there is no way to prove the mathematical theory in the river map at present, which needs experts to analyze slowly.