A Venn diagram is a graphical representation of the union and intersection of two or more sets

A set is a collection of elements. These elements can, for example, be numbers, variables, or objects.

A universal set contains all the elements that are relevant in a particular context. It serves as a reference set from which other sets may be defined.

A subset is contained entirely within a larger set. A is a subset of B if all the elements in A are also contained in B.

Two or more sets are disjoint if they have no elements in common. 

The complement of the subset A is the set of all the elements in a universal set U that are not members of the subset A.

Mathagon

Definition

Three Disjoint Sets

Universal Set and Three Disjoint Subsets

 Three Sets When Two Sets Share Common Elements

Universal Set and Three Subsets When Two Subsets Share Common Elements

Three Sets When One Set Shares Common Elements with the Other Two

Universal Set and Three Subsets When One Subset Shares Common Elements with the Other Two

Three Sets When All Three Sets Share Common Elements in Some Way

Universal Set and 3 Subsets When All Subsets Share Common Elements in Some Way

Venn Diagrams for Three Sets

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