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accepted actual analysis analytical propositions assertion assume atoms basic basis body calculus classical mechanics cognitive coherence color commutative law complete concepts confirmed criterion defined definition depends derived determined electron elements empirical entails equation essential Euclidean Euclidean geometry evidence example existence experiential fact false field first-person experience formal function geometry given hypothesis idea implies induction integration intensional logic interpretation interrelation involved knowledge language laws linguistic logic mathematical induction mathematics matter meaning measure ment mind motion nature non-Euclidean geometries number system objects observation pattern pertaining phase waves phenomena Philosophy physical possible postulates presupposes principle problem propositions qualia qualities quantity quantum mechanics question rational realm reference relation relative scientific semantics sense sense-data sequence significance space specific specious present statement statistical syllogism structure symbols theorem theory theory of relativity things tion true truth truth-values validity verifiability whole words xylene