There are two symbols commonly used in multiplication, one is "X" and the other is ". X was first proposed by British mathematician orrett in 163 1 and initiated by British mathematician heriott.
Leibniz, a German mathematician, thinks that "×" is very similar to the "X" in Latin letters and is easily confused in operation, so he opposes it. But he is in favor of replacing "X" with ". Therefore, the multiplication sign in German mathematics books is different from that in other countries in the world.
Later, Leibniz proposed to use п symbol to represent multiplication, but it was not recognized, and now it has been used in set theory. /kloc-In the 8th century, the American mathematician Audley thought that multiplication was a special increase, and it was the most appropriate way to express multiplication by writing "×" obliquely as "+",so he decided to use "×" to represent the multiplication of two numbers and "×" as the multiplication operation.
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Multiplication related history:
The multiplication formula (also called "Jiujiusong") has been produced in China for a long time. As early as the Spring and Autumn Period and the Warring States Period, Jiujiu songs have been widely used by people. In many works at that time, some multiplication formulas have been quoted.
The original Jiujiu Song started with "998 1" and ended with "224", with 36 phrases.
Bamboo slips unearthed in Han Dynasty and ancient wooden slips unearthed in Dunhuang all started from "998 1". The name "99" is the two words at the beginning of the formula. During the 5th ~10th century, the formula of "99" was extended to "one to one".
About the Song Dynasty (1 1 and12nd century), the order of Jiujiu songs became the same as that used in modern times, that is, from "one for one" to "9981".
The 45 formulas in the book "Arithmetic Enlightenment" written by Zhu Shijie in Yuan Dynasty changed from "1 1" to "99", also called the nine-number method. There are two kinds of multiplication formulas used now, one is 45 sentences, usually called Xiao Jiujiu; There is also a sentence of 8 1, which is usually called the big nine nine. According to the records in the book, The Great Nineteen Nine was first written by Chen Jie of the Qing Dynasty.
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