Set

1. The brackets { } are used to express a set.

2. Each of the well specified object forming a set its called member or element of the set.

3. Each member of set is separated by commas(,)

4. The symbol ∉ ( not belongs to) used to denote that an object is not member of set.

5. A set is collection of well specified object.

6. Set is undefined term.

7. The symbol ∈ (belongs to) used to denote that an object is member of set.

8. Undifinite set

9. Empty set

10. Singlton set

11. Definite set