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) at Preston Brook, and held weekly services there for the bargees. In 1843 Dodgson was given the Crown living of Croft, Yorkshire, by the Prime Minister, Robert Peel, at the urging of Longley. In 1852 he was additionally collated as a canon of Ripon Cathedral and in 1854 became the Archdeacon of Richmond. At Croft he restored the chancel of St Peter's Church and once again started a school, sacrificing part of the glebe to it. He taught there, as did his wife and later some of his children. Dodgson was a contemporary and college friend of Edward Bouverie Pusey,