German-American philosopher and central figure of the Vienna Circle who developed logical empiricism, the linguistic framework theory of metaphysics, and intensional semantics.
The Logical Structure of the World (Aufbau): rational reconstruction of all empirical knowledge from phenomenal primitives. Logical syntax of language: metaphysical statements are neither true nor false but meaningless — violated by the verifiability criterion. Tolerance: the choice between logical frameworks is pragmatic, not a matter of truth.
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