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,
Edwin Dodgson Christian name is a tribute to Canon George Heron, a Cheshire friend of Archdeacon Dodgson. Edwin's mother died when he was four years old and he was raised by his maiden aunt Lucy Lutwidge. He was educated at Twyford and in 1860 he went to Rugby, where the Headmaster was Frederick Temple, who later became the Archbishop of Canterbury. He worked briefly for the Board of Trade before entering Chichester Theological College in September 1871. The college was Anglo-Catholic, a tradition which Edwin held dear, to the chagrin of his elder brother Charles. He was ordained deacon in 1873, and