1 and1More than 700 years ago, China mathematician Liu Hui clearly put forward the concepts of positive numbers and negative numbers for the first time. He also stipulated that "positive counts are red, negative counts are black", that is, red sour odor is used to represent positive numbers, and black counts are used to represent negative numbers. This record is seven or eight hundred years earlier than that of foreign countries.

2. At the same time, it also stipulates the rules of addition and subtraction of rational numbers, and holds that "the theory of positive and negative techniques: the same name benefits each other, and the different names distinguish each other." These homonyms, namely, the same number, different numbers, division and benefit, are subtraction and addition. These ideas did not appear in the west until China in 8900.

India didn't adopt negative numbers until the 7th century. In 628, India's book Rama Revision System interpreted negative numbers as liabilities and losses.

4. 1544, Steve of Germany defined a negative number as a number smaller than any number. 1545, Italian Cardan wrote Dafa, which became the first book about negative numbers in Europe.

More than 5.400 years ago, French mathematician Gillard first used "+"to represent positive numbers and "-"to represent negative numbers. This expression is widely accepted and has been used ever since.

6. Especially in 1637, the French mathematician Descartes invented analytic geometry, established coordinate points, and corresponded plane points with real numbers composed of negative numbers, zero numbers and positive numbers, which explained negative numbers and accelerated people's understanding of negative numbers. However, it was not until the19th century that the German mathematician Wilstrass and others laid a logical foundation for integers, and negative numbers gained a solid position in modern mathematics.

Extended data

First of all, the role of negative numbers

1, negative numbers appear under the premise of artificially specifying the positive direction.

2. Negative numbers are usually used to represent quantities with opposite meanings to positive numbers.

3. When choosing whether to use a positive number or a negative number, first look at whether the positive direction is specified.

4. Generally, the quantity with positive meaning is represented by a positive number, and the quantity with negative meaning is represented by a negative number.

Example: 5 above zero is represented by +5℃; 5 degrees below zero means -5℃. The income of 2000 yuan is represented by +2000 yuan; 500 yuan's expenditure is expressed in -500 yuan.

Second, reading and writing negative numbers.

1, reading: add "negative" before reading.

2. Writing: put "-"before the written number.

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