# History of negative numbers

This is only a brief history of negative numbers. For a more comprehensive coverage and a longer reading, visit this site. For a concise, but right to the point introduction, stay right here with me
Early writings of the Babylonians, Hindus, Egyptian, or Chinese do not contain any trace of the recognition of negative numbers

Nonetheless, they had no problems doing correctly computations involving subtractions such as:

(6 − 4) × (4 − 3) or (8 − 8) × (7 − 5)

The first mentioned of negative numbers can be traced to the Chinese in 200 B.C.E.

The Chinese used red rods to represent positive numbers, but black rods to represent negative numbers

In the fourth century, the Alexandrian mathematician Diophantus said in his text Arithmetica that the following equation is absurd

4x + 20 = 4

He said this because x would have to be -4

In India, negative numbers started appearing around (A.D. 620-630) in the work of the Hindu Brahmagupta

He called positive numbers affirmative quantities. For instance, he said in his work that the sum of two affirmative quantities is affirmative.

This means that the sum of two positive numbers is positive

Around 1300, Chinese mathematician Chu Shi-Ku gave the "rule of sign"

In the 16th century, around 1545, the study of solutions of equations began in Italy.

This led the Italian mathematician Cardano to recognize negative roots as he tried to understand the meaning of the square root of a negative number such as

√ (-2)

During that time, he also clearly stated rules of negative

There has been various notations to represent negative numbers

The Hindus put a small circle or dot over or next to a number to denote that it was negative

The Chinese drew a slash through a portion of the number to indicate that the number negative

For example, -1020 was written as shown below. Here, the slash is drawn over two bars or the number 2 Cardano used the symbol m: for negative numbers. For examples, -6 can be written as m:6

Other popular topics related to integers are modeling integers with chips and integers and inductive reasoning

For more information on the history of negative number check, check this site.

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