/kloc-at the beginning of the 0/8th century, no one used ∵ to mean "because". It was not until 1805 that "⊙" was used for the first time in the Handbook of Popular Mathematics published in Britain. By 1827, Euclid's Elements of Geometry published by Cambridge University used ⊙ for "because" and ∴ for "so" respectively. This usage has become more and more popular and has been used ever since.
Extended data:
Development history
For example, there used to be several kinds of plus signs, but now the "+"sign is widely used. "+"comes from Lavin "et" (meaning "harmony"). /kloc-in the 6th century, Italian scientist Nicolo Tartaglia used the first letter of Italian word "plu" (meaning "add") to indicate addition, and the grass was "μ", which finally became "+". The number "-"is derived from the Latin word "minus" (meaning "minus"). It was abbreviated to M at first, but later it was simplified to "-"because it was written quickly.
/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.
Multiplication has been used for more than a dozen times, and there are two kinds of modern mathematics. 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 "×", like the Latin letter "X", may cause confusion and opposes the use of "×" (in fact, point multiplication is also easily confused with decimal point in some cases). Later, he also proposed to use "∩" to represent multiplication. This symbol has been applied to set theory in modern times.
/kloc-In the 8th century, American mathematician Audley decided to use "X" as the multiplication sign. He believes that "×" is the rotational deformation of "+"and another symbol of addition.
""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, the Swiss mathematician Laha, in his book Algebra, formally took 圙 as a division symbol according to the creation of the masses.
/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 England, thinks that it is most appropriate to use two parallel and equal straight lines to indicate that two numbers are equal, so the equal sign "=" has been used since 1540.
159 1 year, the French mathematician Veda used this symbol in a large number of diamonds, 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.
Any number (full name quantifier)? Derived from the English word Arbitrary, because lowercase and uppercase are easily confused, the first letter of the word is capitalized and then inverted. Similarly, existential number (existential quantifier)? Reverse writing of e from the word Exist.
Baidu encyclopedia-mathematical symbols