Carroll diagram Carroll diagram 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 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 types are those similar to the second one, where two attributes are shown. The <nowiki>'</nowiki>universe<nowiki>'</nowiki> of a Carroll diagram is contained within the boxes in the diagram,
Charles Dodgson (priest) College, Oxford, and who was a friend of Dodgson, used to walk over to visit Daresbury on Sundays, sometimes helping with the church services. Bayne would bring his son Vere, who became a lifelong friend of the young Charles Lutwidge. Other friends and visitors included Richard Durnford, Rector of Middleton, Lancashire; Francis Egerton, Member of Parliament for South Lancashire and John Wilson Patten, MP for North Lancashire. Dodgson was concerned about the canal workers on the Bridgewater Canal running past his parish. Together with Egerton, who was a wealthy local landowner, he converted a barge into a floating chapel, moored