NUMBER SYSTEM

 Natural numbers                                        Whole numbers

N={1,2,3,4,5,6.......}                                   W={0,1,2,3,4.......} 

                             Negative naturals

                          {-1,-2,-3,-4,-5,-6.......}  

Integers

I={......-5,-4,-3,-2,-1,0,1,2,3,4,5........}

Rational Numbers

Q={p/q, q is not equal to zero}

Eg:- 0,1,-1,1/2,-1/5.

Irrational Numbers

Q'={ Which are not rational }

Real Numbers

R=Union of all the above sets like {N ,W,I,Q and Q'.}

Remarks:-

1. The smallest Natural number is 1.

2.The smallest Whole number is 0.