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Natural Numbers

N:

{1,2,3,..}

{1,2,3,..}

Whole Numbers

W:

{0,1,2,3,...}

{0,1,2,3,...}

Integers

J:

{...,-3,-2,-1,0,1,2,3,...}

{...,-3,-2,-1,0,1,2,3,...}

Rational Numbers

Q:

Every number that can be written as a ration a and b , where a and b are integers and b can not =0 .

Every number that can be written as a ration a and b , where a and b are integers and b can not =0 .

Irrational Numbers

I:

Every number that can not be written as a ration a and b , where a and b are integers and b can not =0

Every number that can not be written as a ration a and b , where a and b are integers and b can not =0

Real Number

R:

All rational and irrational numbers

All rational and irrational numbers