- Carroll diagram
A Carroll diagram, or "Lewis Carroll's square"Sun-Joo Shin & Oliver Lemon (2001-2008). [http://plato.stanford.edu/entries/diagrams/ "Diagrams"] . In: "The Stanford Encyclopedia of Philosophy" Fall 2008 Edition, Edward N. Zalta (ed.)] , is a
diagram used for grouping things in a yes/no fashion. Numbers or objects are either categorised as 'x' (having an x) or 'not x' (not having that attribute). They are named afterLewis Carroll , the pseudonym ofCharles Lutwidge Dodgson . [cite web |url=http://io.uwinnipeg.ca/~jameis/Math/L.venn/LEY1.html |title=Venn - Tree - Carroll Diagrams |accessdate = 2006-08-21]Usage
Although Carroll diagrams can be as simple as the one above, the most well known type are those similar to the one on the left, where two attributes are shown. The
' universe' of a Carroll diagram is contained within the boxes in the diagram, as anynumber 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 this field, since they are a tidy way of categorising and displaying information.References
ee also
*
Diagram
*Set theory
*Venn diagram
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