Rudolf Carnap, Meaning and Necessity, 1947
“In Meaning and Necessity, Carnap used semantics to explain modalities. Subsequently he began to work on the structure of scientific theories. His main concerns were (i) to give an account of the distinction between analytic and synthetic statements and (ii) to give a suitable formulation of the verifiability principle; that is, to find a criterion of significance appropriate to scientific language. Other important works were “Meaning Postulates” (1952) and “Observation Language and Theoretical Language” (1958). The latter sets out Carnap’s definitive view on the analytic-synthetic distinction” (tratto da Internet Encyclopedia of Philosophy)
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