Negative integers areNatural numberA number preceded by a minus sign (-).For example, - 1, - 2, - 3, - 38... are all negative integers, and negative integers are less than 0integer, with Z-express.[1]
Except zeroNatural numberyespositive integer, such as 1, 2, 3, 4, 5, 6.Precede positive integers withminus sign"-" is a negative integer.For example: - 1, - 2, - 3, - 4, - 5, - 6integerExpressed in Z, positive integer in Z+Represents a negative integer with Z-express.[2]
Write 0 in front of 1 in the natural number sequence, and you will get aExtended natural sequence：0,1,2,3,4,5，......
After introducing negative numbers, "1, 2, 3, 4, 5,..." is calledpositive integer, "- 1, - 2, - 3, - 4, - 5,..." is callednegtive integer。[3]
Related concepts
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Integer andfractionGeneral termRational number；Infinite non recurring decimal is calledIrrational number；Rational number and irrational numberreal number。All realaggregateR, N for all natural numbers and Z for integers.
Providesorigin、Positive directionandUnit lengthThe straight line of is calledNumber axisEach real number can be represented by a point on the number axis;On the contrary, every point on the number axis represents a real number, and the corresponding relationship between real numbers and points on the number axis is an important basis for the combination of numbers and shapes in mathematics.[4]
Real numbers can be classified as follows (Figure 1):
Figure 1
Real numbers can also be classified according to the following methods (Figure 2):
Figure 2
Properties of negative integers
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A negative integer is an integer less than 0;
The sum of negative integers and negative integers is still a negative integer;
The product of negative integer and negative integer is a positive integer;
A negative integer has a maximum value of - 1 and no minimum value;
