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PROFESSOR CARNAP in his new book proffers a method for analysing and describing the meanings of expressions and, more briefly, discusses the theory of logical modalities, the concepts, that is, of logical necessity and possibility. His meaning-analysis is in the main intended as an improvement upon certain doctrines and practices of Frege. His account of the modal concepts of logic is in the main intended as an improvement upon certain doctrines of C. I. Lewis. Views of Quine, Russell, Tarski, Church and others are also discussed.
Gilbert Ryle (Sat,) studied this question.