Venn diagram

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A Venn diagram is a visual tool used in describing how two or more sets are logically related to one another. The simplest example is a Venn diagram for two sets. Each set is represented by a planar region bounded by a circle, so that the two regions overlap. In the diagram below, set $A$ is represented by the reddish circular disc and set $B$ is represented by the bluish circular disc:

The overlapping region represents the intersection of the sets $A$ and $B$, denoted by $A\cap B$.

Typically, the two sets are subsets of some bigger set $U$, called a universe. Therefore, the corresponding Venn diagram above is shown to be sitting inside a larger rectangular region representing the universe:

Notice that the region representing the universe $U$ is partitioned into $4$ mutually exclusive regions:

Title	Venn diagram
Canonical name	VennDiagram
Date of creation	2013-03-22 17:45:43
Last modified on	2013-03-22 17:45:43
Owner	CWoo (3771)
Last modified by	CWoo (3771)
Numerical id	16
Author	CWoo (3771)
Entry type	Definition
Classification	msc 00A05
Classification	msc 00A06
Classification	msc 03E99