Sets

A set is a collection of well defined and distinct objects. The objects in the set are called elements.

Set Notation

The symbol ∈ means is an element of

The symbol ∉ means is not an elemnt of

The symbol # means the number of elemnts in. This is also known as the cardinal number of the set.

The symbol ∅ or {} is used to represent the null set or the empty set. A set which contains no elements.

The symbol ∪ represents the union of two sets.

The symbol ∩ represents the intereection of two sets.

The universal set is the set that contains all elemnts under consideration.

The symbol ‘ represents the compliment of a set. The compliment of set A is the set of elements in the universal set that arent elements of set A.

The symbol \ represents the set of elemnts that are in the first set but not the second.

Venn Diagrams