Notation and Symbol

# Some standard notations to represent sets :

   N     :    the set of natural numbers
   W    :    the set of whole numbers
   Z      :    the set of integers
   Z⁺   :    the set of positive integers

   Z^-    :    the set of negative integers

   Q     :    the set of rational numbers

    I      :    the set of irrational numbers 

    R     :    the set of real numbers

    C     :    the set of complex numbers

# Others frequently used Symbols are :

    

    ∈   :  ' belongs to '   

    ∉   :  ' does not belongs to '

    ∃    :  ' there exist '

    ∄    :  ' there does not exist '