Numbers
Definition
We call a set numbers if the elements can be calculate under some closed rules.
Examples:
-
Integer($\mathbb Z$): $$ {0,1,2,3,...} $$ -
Rational Number($\mathbb Q$): $$ {0,\dfrac{1}{2},\dfrac{2}{3},...} $$ -
Real Number($\mathbb R$): $$ {0,1,\dfrac{1}{2},\pi,\sqrt 2,...} $$ -
Complex Number($\mathbb C$): $$ {0,i,\dfrac{1}{2},\pi,\sqrt 2 + 5i,...} $$