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thumb|A simple Carroll diagram.{{anchor|Biliteral|Triliteral|Multiliteral}}A Carroll diagram, Lewis Carroll's square, biliteral diagram or a two-way table is a diagram used for grouping things in a yes/no fashion. Numbers or objects are either categorised as 'x' (having an (wiktionary:attribute#Noun|attribute) x) or 'not x' (not having an attribute 'x'). They are named after Lewis Carroll, the pseudonym of polymath Charles Lutwidge Dodgson.

Usage

thumb|A more complex Carroll diagram.Although Carroll diagrams can be as simple as the first one above, the most well known types 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.Carroll diagrams are often learnt by schoolchildren, but they can also be used outside the field of education, since they are a tidy way of categorising and displaying information.

See also

{{commons category|Carroll diagrams}}

• Diagram
• Karnaugh map
• Set theory
• Venn diagram
• The Game of Logic

References

Further reading

• BOOK, The Logic Diagram, Gailand, Mac Queen, October 1967, Thesis, McMaster University,weblink 2017-04-14, dead,weblink 2017-04-14,
• BOOK, Cogwheels of the Mind: The Story of Venn Diagrams, Anthony William Fairbank, Edwards, Anthony William Fairbank Edwards, Johns Hopkins University Press, 2004, 0-8018-7434-3, Baltimore, Maryland, USA,weblink

External links

• WEB, Bogomolny, Alexander, Alexander Bogomolny, Lewis Carroll's Logic Game, Cut-the-knot, 2017, 1996,weblink 2017-05-03, live,weblink" title="web.archive.org/web/20170503162522weblink">weblink 2017-05-03,
• WEB, Carroll Diagram (and Game of Logic) Interactive Demonstrator at lewiscarrollresources.net,weblink
• Lewis Carroll: Logic, Internet Encyclopedia of Philosophy