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 of St James Church in Jamestown, St Helena. St James is the oldest Anglican place of worship south of the equator, having been consecrated in 1772. As at Tristan, so also at St James, Dodgson encouraged choral services and worked hard in the parish. Indeed, this was the only time in his ministry when Dodgson had his own parish church. It appears that his relationship with the elderly Bishop of St Helena was difficult. Another member of the clergy on the island wrote, "I am afraid that poor Mr. Dodgson is not the comfort to the Bishop that was anticipated".