The operation symbol does not appear immediately with the operation. For example, China had addition and subtraction operations at least in Shang Dynasty (about 3,000 years ago), but like several other ancient civilizations such as Egypt, Greece and India, there was no addition symbol. Writing two numbers together means adding up. This relic can still be seen in today's fractional texts. By the third century, there was a negative sign "↑" in Greece, but there was still no plus sign. In the 6th century AD, abbreviations of words appeared as operation symbols in India. Subtraction is to draw a point on subtraction.

Later, Europeans inherited the practice of India. For example, the Latin letter P (the first letter of P (plus sign for addition) means addition, and the first letter of Latin letter M (minus sign for subtraction) means subtraction.

+and-appeared in the Middle Ages. It is said that at that time, after the wine merchants sold out, they marked the wine in the barrel with horizontal lines, and when the wine in the barrel increased again, they crossed out the original horizontal lines with vertical lines. So "-"means decrease and "+"means increase.

1489, german mathematician Weidemann (Widman, 1460-? ) In his works, he first used "+"and "-"to represent surplus and deficiency, and in 15 14, the Dutch mathematician Hoecke used them as algebraic operation symbols. Later, it was popularized by the French mathematician Vieta (1540- 1603), and it was not recognized until 1630.

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