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A definability theorem for first order logic - MaRDI portal

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A definability theorem for first order logic

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Publication:6503667

arXivmath/9706206MaRDI QIDQ6503667

Author name not available (Why is that?)


Abstract: For any first order theory T we construct a Boolean valued model M, in which precisely the T--provable formulas hold, and in which every (Boolean valued) subset which is invariant under all automorphisms of M is definable by a first order formula. Our presentation is entirely selfcontained, and only requires familiarity with the most elementary properties of model theory.












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