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Venn, John 1834-1923
English logician

Born near Hull, Humberside, he became a Fellow of Caius College, Cambridge (1857), developed George Boole's symbolic logic, and in his Logic of chance (1866), the frequency theory of probability. He is best known for 'Venn diagrams', pictorially representing the relations between sets, though similar diagrams had been used by Gottfried Leibniz and Leonhard Euler.