Venn diagram is a system of organization of numerical sets, where elements are grouped into geometric figures, facilitating the visualization of the division made between the different groups.
The Venn diagram, also known as a Set Diagram or Logic Diagram, is often used as a method to organize information and data collected in quantitative surveys. In this case, it is possible to ascertain more clearly statistical data obtained through opinion polls, for example.
Aesthetically, the Venn diagram is made up of overlapping geographic figures, usually circles. Similar elements between the different groups are represented precisely on the overlapping parts of the circles (the intersection).
This diagram was created by the English mathematician John Venn (1834 - 1923), with the purpose of facilitating the representation of the relationships of unity and intersection between different sets.
Example:
U = union
∩ = intersection
A = (1, 2, 3, 4, 5, 7)
B = (5, 6, 7, 8, 9)
AUB = (1, 2, 3, 4, 5, 6, 7, 8, 9)
A ∩ B = (5, 7)
THE union of sets A and B represents all the elements that are in each of the circles. THE intersection between A and B, on the other hand, consists of the elements that are present in both sets simultaneously. In the image above, for example, the numbers 5 and 7 are present in groups A and B.
See also the meaning of Diagram, Ishikawa diagram it's the Pareto Diagram.