John Venn

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

Allies

Venn often teams up with The Sigil to find crime and solve problems in set theory (nonfiction).

John Venn / John Glenn

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

TO DO: draw Venn diagram (nonfiction) illustration the difference.

Fiction cross-reference

• The Sigil

Nonfiction cross-reference

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