Rationale Zahlen

IN = Menge der natürlichen Zahlen

IN = {1,2,3,...}

IN₀ = {0,1,2,3,...}

IB = Menge der gebrochenen Zahlen

IB = {^p/_q ,p,q є IN, q ≠ 0}

Z = Menge der ganzen Zahlen

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

Z⁺ = {1,2,3,...}

Z⁺₀= {0,1,2,3,...}

Z^-= Menge der negativen ganzen Zahlen

Z^-= {...,-3,-2,-1}

Symbol: Q

Q = {^p/_{q ,p,q є Z, q≠ 0}}