The invention and use of mathematical symbols are later than numbers, but they are much more numerous. Now there are more than 200 kinds in common use, and there are more than 20 kinds in junior high school math books. They all had an interesting experience.
For example, there used to be several kinds of plus signs, but now the "+"sign is widely used.
+comes from the Latin "et" (meaning "and"). /kloc-in the 6th century, the Italian scientist Nicolo Tartaglia used the initial letter of "più" (meaning "add") to indicate adding, and the grass was "μ" and 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.
Multipliers have been used for more than a dozen times, and now they are commonly used in two ways. One is "x", which was first proposed by British mathematician orcutt on 163 1; One is "",which was first created by British mathematician heriott. Leibniz, a German mathematician, thinks that "×" is like the Latin letter "X", so he opposes it and agrees to use "×". He himself proposed to use "п" to represent multiplication. But this symbol is now applied to set theory.
/kloc-In the 8th century, American mathematician Audley decided to use "×" as the multiplication symbol. He thinks "×" is an oblique writing of "+",which is another symbol of increase.
""was originally used as a minus sign and has been popular in continental Europe for a long time. Until 163 1 year, the British mathematician Orkut used ":"to represent division or ratio, while others used "-"(except lines) to represent division. Later, in his book Algebra, the Swiss mathematician Laha officially used "∫" as a division symbol according to the creation of the masses.
The square root number was once represented by the combination of the first and last letters of the Latin "root". /kloc-At the beginning of the 0/7th century, the French mathematician Descartes used "√" for the first time in his Geometry. "R" is a variant of the Latin word line "R", and "-"is a closed line.
/kloc-in the 6th century, the French mathematician Viette used "=" to indicate the difference between two quantities. However, Calder, a professor of mathematics and rhetoric at Oxford University in the United Kingdom, thinks that it is most appropriate to use two parallel and equal straight lines to indicate that two numbers are equal, so the symbol "=" has been used since 1540.
159 1 year, the French mathematician Veda used this symbol extensively in Spirit, and it was gradually accepted by people. /kloc-In the 7th century, Leibniz in Germany widely used the symbol "=", and he also used "∽" to indicate similarity and ""to indicate congruence in geometry.
Greater than sign ">" and less than sign "
References:
/s？ wd = % BC % D3 % BA % C5+% BC % F5 % BA % C5+% B7 % A2 % C3 % F7。 cl=3