The first symbols are "+"and "-". More than 500 years ago, German mathematician Weidemann added a vertical bar to the horizontal line to indicate the increase. On the contrary, removing a vertical bar from the plus sign means reducing. However, these two symbols are recognized by everyone, starting from the official application of them by the Dutch mathematician Braun Ik in 15 14. There is also a saying that "+"comes from the Latin "et" (meaning "and"). /kloc-in the 6th century, Italian scientist Nicolo Tartaglia used the initial letter of "più" (meaning "add") to express add, 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 wine is sold in barrels. The new wine is poured into the barrel, and a vertical line is added to the "-",indicating that the original line has been erased, thus becoming a "+".
"X" has been used more than a dozen times, and now there are two usages. One is "X", which was first put forward by the British mathematician Oghart more than 300 years ago. /kloc-In the 8th century, American mathematician Audley decided to use "X" as the multiplication sign. He thinks "X" is another way to write "+"obliquely, which means to increase. Another representation of multiplication symbol is "",which was initiated by British mathematician heriott. Leibniz, a German mathematician, thinks that the symbol "×" is very similar to the Latin letter "X", so he opposes and agrees to use the symbol ". He himself proposed to use "п" to represent multiplication, but this symbol is now applied to set theory.
"⊙" didn't mean division at first, but it was popular in continental Europe as a minus sign for a long time. /kloc-In the 8th century, Hannah, a Swiss, first mentioned division in Algebra, which means decomposition. "A horizontal line separates two points, which means dividing them into several parts." "χ" is officially recognized as a divisor.
/kloc-in the 6th century, the French mathematician Viette used "=" to indicate the difference between two quantities. However, Colder, a professor of mathematics and rhetoric at Oxford University in the United Kingdom, believes that it is most appropriate to use two parallel and equal straight lines to indicate that two numbers are equal, so the equal sign "=" begins with 1540.
Use it. 159 1 year, which is widely used in diamonds by the French mathematician Veda and gradually accepted by people. /kloc-in the 0/7th century, the symbol "=" was widely used in Leibniz, Germany.