Sets of Numbers



Definitions:

N : Natural numbers

N0 : Whole numbers

Z : Integers

Z+ : Positive integers

Z : Negative integers

Q : Rational numbers

C : Complex numbers

Formulas:

Natural numbers (counting numbers )

N={1,2,3,}

Whole numbers ( counting numbers with zero )

N0={0,1,2,3,}

Integers ( whole numbers and their opposites and zero )

Z={,2,1,0,1,2,}
Z+=N={1,2,}
Z={,3,2,1}
Z=Z0Z

Irrational numbers: Non repeating and nonterminating integers

Real numbers: Union of rational and irrational numbers

Complex numbers:

C={x+iy | xR  and  yR}
NN0ZQRC