Extended data:
Integer refers to a number without a decimal part, which is what we often call "integer". They include positive integers, negative integers and zero.
Positive integers are integers greater than zero, such as 1, 2, 3, 4, 5, etc. They are located to the right of zero on the number axis. A positive integer is a part of a natural number, and a natural number is a set of positive integers and zeros.
Negative integers are integers less than zero, such as-1, -2, -3, -4, -5, etc. They are located to the left of zero on the number axis. A negative integer is a part of an integer, and an integer is a set of positive integers, negative integers and zeros.
Zero is a special case of integer, which is neither positive nor negative. Zero is a part of natural number, integer, rational number, real number and complex number.
Integers are widely used in our life. For example, the numbers we use to count are all integers, such as 1 apple, 2 bananas, 3 oranges and so on. Time can also be expressed by integers, such as 1 hour, 2 hours, 3 hours, etc. The temperature can also be expressed by integers, such as 0 degrees Celsius, 10 degrees Celsius, 20 degrees Celsius, etc.
Integer is one of the basic concepts in mathematics. They have important applications in arithmetic, algebra, geometry, calculus and other branches.
For example, we use integers for addition, subtraction, multiplication and division in arithmetic, such as 1+2=3, 3- 1=2, 2×3=6, 6÷3=2, etc. In algebra, we use integers to solve equations, such as 2x+3=7, 5y-2=3 and so on. In geometry, we use integers to represent the length and area of a line segment. In calculus, we use integers to represent the degree of functions, the order of derivatives and so on.
In a word, integers are a very important part of our life and mathematics. They include positive integers, negative integers and zero. Integers are widely used in our lives, such as counting, indicating time, indicating temperature and so on. Integers also have important applications in mathematics, such as arithmetic, algebra, geometry, calculus and other branches.