Representation Of SET

There are two methods to represent a SET :

      (i)  Roster Method (or Tabular Form / Method ) :

             In this method a set is represented by listing all its elements, separating them  by commas and                  enclosing them in curly bracket.

            e.g :  if A be the set of natural number less than 7 then 

                      A = { 1 , 2 , 3 , 4 , 5 , 6 }

      Note : To write a set in Roster form elements are not to be repeated i.e. all elements are taken as                              distinct.

      (ii) Set-builder Form :

               In this form elements of the set are not listed but these are represented by some common                             property.

                e.g. : Let V be the set of vowels of English alphabet then V can be written in the set builder form                             as:

                V = { x : x is a vowel of English alphabet }