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These included : the opposition to all metaphysics , especially ontology and synthetic " a priori " propositions ; the rejection of metaphysics not as wrong but as meaningless ( i.e. , not empirically verifiable ) ; a criterion of meaning based on Ludwig Wittgenstein 's early work ( which he himself later set out to refute ) ; the idea that all knowledge should be codifiable in a single standard language of science ; and above all the project of " rational reconstruction , " in which ordinary-language concepts were gradually to be replaced by more precise equivalents in that standard language .
 person: Ludwig Wittgenstein
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 person: Ludwig Wittgenstein