Abstract Bertrand Russell, in the second of his 1914 Lowell lectures, Our Knowledge of the External World, asserted famously that ‘every philosophical problem, when it is subjected to the necessary analysis and purification, is found either to be not really philosophical at all, or else to be, in the sense in which we are using the word, logical’ (Russell, 1993: 42). He went on to characterize that portion of logic that concerned the study of forms of propositions, or, as he called them, ‘logical forms’.
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