Areas that don't overlap show the differences between sets, and a complement set refers to everything not shared by a particular set or subset. The History and Origin of Venn Diagrams John Venn ...

This is the total of the people that are not in the set of people who own a cat (the complement of cat owners). Make sure that the number of elements in the Venn diagram is equal to the number of ...

union and complement. It was introduced in the late 1800s by English logician, John Venn, although it is believed that the method originated earlier. THIS DEFINITION IS FOR PERSONAL USE ONLY.