John Venn

Venn computing one of his famed diagrams.

John Venn (? - ?) is a crime-fighting set theorist (nonfiction).

Venn is the inventor of machines for detecting and repelling demons, now known as Venn diagrams.

Venn diagrams also show all possible logical relations between a finite collection of different sets; see Venn diagram (nonfiction). Venn often teams up with The Sigil to find crime and solve problems in set theory (nonfiction).

People sometimes confuse "John Venn" with "John Glenn".

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Fiction cross-reference

• The Sigil

Nonfiction cross-reference

• John Venn (nonfiction)
• Set theory (nonfiction)