What is an arbitrary mathematical symbol? Any element exists in a random set. The invention and use of mathematical symbols are later than numbers, but they are much more numerous. There are more than 200 commonly used, and there are at least 20 commonly used in junior high schools. They all had an interesting experience.

+comes from the Latin "et" (meaning "and"). /kloc-in the 6th century, the Italian scientist Nicolo Tartaglia used the first letter of "plu" (meaning "plus") to indicate addition, and the grass was "μ", which finally became "+". The number "-"evolved from the Latin word "minus" (meaning "minus"), abbreviated as m, and then omitted the letter, it became "-".

It is also said that wine merchants use "-"to indicate how much a barrel of wine costs. After the new wine is poured into the vat, a vertical line is added to the "-",which means that the original line is erased, thus becoming a "+"sign.

/kloc-In the 5th century, German mathematician Wei Demei officially determined that "+"was used as a plus sign and "-"was used as a minus sign.