Introduction A set is a group of objects. Each object is known as as a member of the set. A set can be represented using curly brackets. The universal set is the set of all sets.
All sets are therefore subsets of the universal set.
Venn Diagrams Venn diagrams are used to represent sets. In Venn diagrams, sets are usually represented using circles. The universal set is the rectangle. The set A is therefore a subset of the universal set. A' together cover every possible eventuality.