0 is an extremely important number, and the discovery of 0 is called one of the great discoveries of mankind. In ancient China, 0 was called Jinyuan number (meaning extremely precious number). The data of 0 is said to have been invented by Indians in the 5th century. 1202, a businessman wrote an abacus book. In the east, mathematics is mainly based on operation (in the west, it was written in geometry at that time). "Nine numbers of Indians, plus the symbol 0 invented by Arabs, can write all the numbers ..." For some reasons, when the symbol 0 was first introduced to the West, it once caused confusion in the West. At that time, because the west believed that all numbers were positive numbers, the number 0 would make many formulas and logics untenable (such as dividing by 0), and it was even considered as the devil's number, so it was banned. It was not until about 15 and 16 that zero and negative numbers were gradually recognized by westerners, which led to the rapid development of western mathematics.