Number System

All counting numbers are called natural numbers which are denoted by N.

Example: N ={1, 2 , 3 , 4 , 5..... $\infty$}

All counting numbers together with zero are called whole numbers. They are denoted by W.

Example: W ={0, 1, 2 , 3 , 4 , 5..... $\infty$}

The numbers 0 , 1 , -1 , 2 , -2 , 3 -3 .. are called integers.

Note: Zero is called called zero integer.

flowchart TB
A[Integers] --> B[Positive Integer eg: 1, 2..]
A --> C[Zero]
A --> D[Negative integers eg -1, -2 , -3 ...]

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A natural number other than 1, which has no other factor exept 1 and itself, is called prime number.

Example: 2, 3, 5, 7, 11 etc

Note: 2 is the only Prime which is even. All other prime number is odd. 2 is the smallest prime number.

The two natural numbers whose H.C.F = 1 are called co-prime numbers.
Examples: {7,9}, {7,11} etc

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