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What are the math skills of Jiugongge?
1. Exclusion method: using numbers to find the only space that can be filled in a cell is called exclusion method, and the only space that can be filled by numbers is called hidden list.

Two, according to the different scope of action, the elimination scheme can be divided into the following three types:

1, the only space that can be filled in a number is called hidden single in box in the "palace" unit, also known as palace exclusion method.

2. The only space that a number can fill is called the hidden single line in the "row" cell, which is also called the row exclusion method.

3. The only space that a number can fill is called the hidden single column in the "row" cell, also known as the row exclusion method.

4. Unique remainder method: using a lattice to find a unique fillable number is called remainder method, and using a lattice to find a unique fillable number is called naked list.

5. The remainder method is a method to delete numbers that have already appeared in peer groups, and each peer group has 20 peer groups.

Extended data:

evolutionary process

On the river map, black spots and white spots arranged in several arrays contain infinite mysteries; The pattern on Luoshu just corresponds to nine numbers from 1 to 9, and the sum of three numbers on vertical, horizontal, oblique and three lines is equal to15;

At that time, people did not know that this was the third-order magic square in modern mathematics. They call this mysterious number arrangement Nine palace map. Scholars at home and abroad have conducted long-term exploration and research on this issue, believing that it is the crystallization of the spiritual thinking of Chinese ancestors and the first milestone of ancient civilization in China.