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Add. MS c/104/64
Title
Notes by J. N. Keynes entitled 'Dodgson's problem'
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- [1894?] (Creation)
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1 doc
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Refers to the fallacy involved in the regarding of proposition if A then not C as the contradictory of the proposition if A then C. Refers to the second edition of his Formal Logic, and to a third edition of the latter, which he is working on. Refers to an accompanying slip [not included]. Sets out an argument, involving an equation including Q, R, X, Y and K, and claiming that it is not valid. Concludes that if X is Y, then and are not both true, but that one cannot infer absolutely that and are not both true.
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Perhaps relating to correspondence between C. L. Dodgson and Sidgwick in Mar 1894 regarding a logic problem: see ADD.MS.c/93/106-108 and ADD.MS.c/100/93