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The Logic of the Propositions of Logic
Ludwig wickenstein's first book radicalized some of the ideas that russell and freger brought to bear. He made two claims: one was that propositions of logic were tautologies, by which he meant they were kind of degenerate cases of genuine propositions. The other important idea that the vienna circle developed was a claim he made about metaphysical and philosophical propositions. His argument in the tractatus was that they were nonsensical, that they weren't genuinely significant propositions at all.