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He created the "Venn diagram" which is used when dealing with "sets" in mathematics.
make a venn diagram of set AB/C group of add number
A picture of a Venn diagram is in the related links. They are useful because they help you map out problems such as "If there are 3 students in math, 5 students in science and 6 students in total, how many are in both math and science?" To this, you can use the Venn diagram to reason that since there seem to be 8 students in total if math and science are separate, there must be 2 students in both classes.
I think it would be pretty safe to say he invented the Venn Diagram
No country was ever a Venn diagram.