# Category:Venn diagrams

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• These are comics that relate to Venn diagrams.
• They should not be confused with Euler diagrams although some of the comic that mention Venn diagrams actually shows Euler diagrams instead.
• If Venn diagrams are mentioned, even though it is an Euler diagram, not a Venn diagram, then they will still be included here.
• Randall seems to have made mistakes, or maybe done this on purpose as indicated with the comic 2721: Euler Diagrams.
• Apart from that comic where he mentions that he wishes to call all Euler diagrams for Venn diagrams he has also made the "mistake" two time before:
• A Venn diagram shows all possible combinations of two or more sets, including those with no elements, and therefore all of the circles must intersect.
• An Euler diagram need only depict the non-empty combinations, and therefore does not have this constraint.
• All Venn diagrams are also Euler diagrams, but not the other way around!
• Thus this category is a sub category of Euler diagrams.
• Only the three mistake comics should be included directly in both categories.
• In a Venn diagram every possible intersection must be shown.
• In general for an n component Venn diagram there are 2n hypothetically possible zones, corresponding to some combination of inclusion or exclusion in each of the component sets.
• A Venn diagram with 2 circles, see 668: Pandora, has 22 = 4 zones; one overlap zone, two zones without overlap and one outside zone.
• 2122: Size Venn Diagram is the first comic to include five components, previously only Venn diagrams with two or three circles have been used in xkcd. It thus has 25 = 32 zones.

## Pages in category "Venn diagrams"

The following 12 pages are in this category, out of 12 total.