A Carroll diagram, or Lewis Carroll's square, is a diagram used for grouping things in a yes/no fashion. Numbers or objects are either categorised as 'x' (having an attribute x) or 'not x' (not having an attribute 'x'). They are named after Lewis Carroll, the pseudonym of Charles Lutwidge Dodgson.
Although Carroll diagrams can be as simple as the first one above, the most well known type are those similar to the second one, where two attributes are shown. The 'universe' of a Carroll diagram is contained within the boxes in the diagram, as any number or object has to either have an attribute or not have it.
- Sun-Joo Shin & Oliver Lemon (2001-2008). "Diagrams". In: The Stanford Encyclopedia of Philosophy Fall 2008 Edition, Edward N. Zalta (ed.)
- "Venn - Tree - Carroll Diagrams". Retrieved 2010-09-10.
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