John Venn Day

John Venn would have been 180 today (August 4). In celebration, Google put up an interactive Venn Diagram doodle, which is pretty amazing.

Also, TIL that it’s not a Venn diagram if it doesn’t contain all possible intersections, a restriction that doesn’t apply to Euler diagrams.  So representing an empty intersection by two non-intersecting regions is, technically, not a Venn diagram; and Venn diagrams for more than three sets get harder and harder to draw. Check out the informative Wikipedia entry.

I have a previous entry on humorous Venn (and Euler) diagrams around the Internets.

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