Positive numbers are positive real numbers, including positive integers, positive fractions (including positive decimals) and positive irrational numbers. And positive integers are only a small part of positive numbers. Positive numbers do not include 0, which is neither positive nor negative. Anything greater than 0 is positive.
If all positive numbers are greater than zero, then all positive numbers are greater than negative numbers. Zero is neither positive nor negative. Then -a
2. Negative numbers are mathematical terms. Numbers less than 0 are called negative numbers, and negative numbers and positive numbers represent quantities with opposite meanings. Negative numbers are marked with minus sign (minus sign) "-"and positive numbers, such as? 2 stands for the antonym of 2.
If all negative numbers are less than zero, then all negative numbers are less than positive numbers. Zero is neither positive nor negative. Then -a
Extended data
Negative number originates from the reality of social life, and its appearance is the inevitable result of the development of mathematics. China was the first country to use negative numbers in the world, and it was used at the latest in 1 century BC. India didn't really accept the concept of negative numbers until17th century.
Negative numbers will be generated in production practice:
Odd and even, boundary and unbounded, good and evil, left and right, one and many, male and female, straight and curved, square and moment, bright and dark, dynamic and static. These opposing concepts written above were considered as 10 opposing concepts in the whole universe by the famous Pythagorean school more than two thousand years ago.
Therefore, people realized more than two thousand years ago that the world was made up of many contradictory things. If we want to know and transform the world, we should start with these contradictory things. Since this is the universal law of all things, mathematics should also be observed.
People often encounter various quantities with opposite meanings in their lives. For example, there are surpluses and deficits in accounting; When calculating the rice stored in the granary, sometimes you should remember the grain and sometimes you should remember the valley. For convenience, people think that numbers have opposite meanings. So people introduced the concepts of positive number and negative number, and recorded the excess money as positive number of grain and the loss of money and grain as negative number. It can be seen that both positive and negative numbers are produced in production practice.
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