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1 Chart That Explains Why People Are Wrong About Venn Diagrams

Pedantry level: infinite.

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Most things people call Venn diagrams are not Venn diagrams.

Tom Phillips/BuzzFeed

Lots of them are actually Euler diagrams. A Venn diagram has to show all possible logical relationships between sets, even if they're not things that exist; an Euler diagram doesn't.

If you want some added explanation, here are more charts than promised in the headline.

Tom Phillips/BuzzFeed

Venn diagrams are (roughly) a very specific type of Euler diagram. For example, a Venn diagram has to show the overlap between two sets, even if there's nothing in that overlap (shown by shading it in black, as above).

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