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| − | *These are comics that relate to {{w|Venn diagram}}s.
| + | Comics with {{w|Venn diagram}}s. Be not confused with {{w|Euler diagram}}s, Venn diagrams are much more restricted. |
| − | **They should not be confused with [[:Category:Euler diagrams|Euler diagrams]] although some of the comic that mention Venn diagrams actually shows Euler diagrams instead.
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| − | **If Venn diagrams are mentioned, even though it is an Euler diagram, not a Venn diagram, then they will still be included here.
| + | In a Venn diagram every possible intersection must be shown. In general for an n component Venn diagram there are 2<sup>n</sup> 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 2<sup>2</sup> = 4 zones; one overlap zone, two zones without overlap and one outside zone. |
| − | *[[Randall]] seems to have made mistakes, or maybe done this on purpose as indicated with the comic [[2721: Euler Diagrams]].
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| − | **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:
| + | [[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. |
| − | ***[[1180: Virus Venn Diagram]]
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| − | ***[[2090: Feathered Dinosaur Venn Diagram]]
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| − | ***All three are now included in both categories, as Venn diagrams are mentioned even though they are not drawn!
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| − | **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.
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| − | **An Euler diagram need only depict the non-empty combinations, and therefore does not have this constraint.
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| − | ***All Venn diagrams are also Euler diagrams, but not the other way around!
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| − | ***Thus this category is a sub category of Euler diagrams.
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| − | ***Only the three mistake comics should be included directly in both categories.
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| − | *In a Venn diagram every possible intersection must be shown.
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| − | **In general for an n component Venn diagram there are 2<sup>n</sup> hypothetically possible zones, corresponding to some combination of inclusion or exclusion in each of the component sets.
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| − | **A Venn diagram with 2 circles, see [[668: Pandora]], has 2<sup>2</sup> = 4 zones; one overlap zone, two zones without overlap and one outside zone.
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| − | **[[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 2<sup>5</sup> = 32 zones.
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| | [[Category:Charts]] | | [[Category:Charts]] |
| − | [[Category:Euler diagrams]]
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