John Venn

Venn computing one of his famed demon-hunting diagrams.

John Venn (? - ?) is a famed Set theorist and crime-fighter.

Venn is the inventor of Venn diagrams, now widely used for detecting and repelling demons.

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 by inventing new Set theory paradigms.

In the News

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  H. H. Holmes must be stopped, says Venn.

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  New sigil is perfect for The Sigil, say experts.

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  Writer/sorceror Roger Zelazny (working with artist William Blake) conjures a Venn diagram against an unnamed Demon.

Fiction cross-reference

• The Sigil (crime fighter)

Nonfiction cross-reference

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