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Natural Numbers A number used to measure the number of pieces of a thing or to express the order of things. i.e. digital 1, 2, 3, 4 ,......The number represented. Natural numbers start with 1 and follow each other to form an infinite set.

There are addition and multiplication operations in the set of natural numbers, and the result of adding or multiplying two natural numbers is still a natural number, and it can also be subtracted or divided, but the results of subtraction and division may not be natural numbers, so subtraction and division operations are not always true in the set of natural numbers. Natural numbers are the most basic of all the numbers that people know. In order to have a strict logical foundation for the number system, mathematicians in the 19th century established two equivalent theories of natural numbers, the ordinal number theory of natural numbers and the cardinal theory, so that the concepts, operations and related properties of natural numbers were strictly discussed.

Integer

Sequence, -2, -1, 0, 1, 2,...

The number in is called an integer The whole of an integer constitutes an integer set, which is a ring, denoted as z (usually written as a hollow letter z in modern times) The potential of the ring z is Alev 0

A given integer n can be negative (n z-), non-negative (n z*), zero (n = 0), or positive (n z+).

Rational number: A number that can be accurately expressed as the ratio of two integers

For example, 3,,,7 and 22 are all rational numbers

Integers and commonly known fractions are rational numbers, and rational numbers can also be divided into positive rational numbers, 0s, and negative rational numbers

In the decimal representation system of numbers, a rational number is a number that can be expressed as a finite decimal or an infinite cyclic decimal, and this definition also applies in other carry systems, such as binary

All rational numbers form a set, the set of rational numbers, which is represented by the bold letter q, and some modern math books are represented by the hollow letter q

The set of rational numbers is a subset of the set of real numbers, and the related content is seen in the expansion of the number system

A set of rational numbers is a field in which four operations (except 0 for the divisor) can be performed, and for these operations the following laws hold true (a, b, c, etc., all represent arbitrary rational numbers).

An irrational number refers to an infinite non-cyclic decimals.

In particular, it is important to note that infinitely cyclic decimal numbers are often mistaken for irrational numbers.

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Real Numbers A number where there is no imaginary part; A general term for rational numbers and irrational numbers.

That is, in all integers greater than 1, there is no other divisor except 1 and itself, and this integer is called a prime number, and a prime number is also called a prime number. This final rule is only a literal explanation. Is it possible to have an algebraic formula in which the value of the algebraic formula substituted is prime when the number represented by a letter is any specified value?

The distribution of prime numbers is irregular and often incomprehensible. For example, are prime numbers, but 301 and 901 are composites.

In an integer, the number divisible by 2 is even, and vice versa, the even number can be represented by 2k, and the odd number can be represented by 2k+1, where k is an integer.