John Venn
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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
H. H. Holmes must be stopped, says Venn.
Writer/sorceror Roger Zelazny (working with artist William Blake) conjures a Venn diagram against an unnamed Demon.
Georg Cantor to lecture on applications of Set theory to Venn diagrams.
