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The Diagrams Book by Kevin Duncan

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23  THE VENN DIAGRAM

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• Venn Diagrams were studied in detail by John Venn in 1880, although he called them Euler diagrams after Leonhard Euler who looked at them a century before.

• This is a highly flexible system of interlocking circles that are useful for identifying the contrast between overlapping qualities or areas of uniqueness.

• The minimum number of circles is two, and the maximum for most uses is three. (Highly advanced set theorists have gone as far as 16 intersections, but this is too complex for business purposes.)

• Once the circles are interlocked, totally discrete areas are revealed (in which there is no overlap). These can then ...

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