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,
Skeffington Lutwidge Skeffington Lutwidge Skeffington Lutwidge (13 March 1737 – 15/16 August 1814) was an officer of the Royal Navy, who saw service during the American War of Independence, and the French Revolutionary and Napoleonic Wars. He had a particular connection with Horatio Nelson, who served under Lutwidge as a midshipman on an expedition to the Arctic in in 1773, and again in 1801 while a captain, when Lutwidge was commander in chief in the Downs. Lutwidge served for a considerable period and in a number of ships, in American waters during the War of Independence. During this time he captured a