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William Ernest Johnson (23 June 1858 – 14 January 1931) was a British logician mainly remembered for his ''Logic'' (1921–1924), in 3 volumes. In 1924, in volume III he introduced the important concept of exchangeability.〔Zabell (1992)〕 ==Biography== Johnson graduated MA and was Sidgwick lecturer in Moral Sciences. He was elected a Fellow of King's College, Cambridge in March 1902, and taught there for nearly thirty years. He wrote a bit on economics, and John Maynard Keynes was one of his students. Johnson was a colleague of Keynes's father, John Neville Keynes. He was a Cambridge Apostle. ''Logic'' was dated at the time of its publication, and Johnson can be seen as a member of the British logic "old guard" pushed aside by the ''Principia Mathematica'' of Alfred North Whitehead and Bertrand Russell. Yet an article entitled "The Logical Calculus" (Johnson 1892) reveals that he had nontrivial technical capabilities in his youth, and that he was significantly influenced by the formal logical work of Charles Sanders Peirce. The article begins as follows:
A.N. Prior's ''Formal Logic'' cites this article several times. John Passmore tells us:
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