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Preprint Number 679
679. Alexander Prestel Definable henselian valuation rings E-mail: Submission date: 20 January 2014. Abstract: We give model theoretic criteria for \exists\forall and \forall\exists-formulas in the ring language to define uniformly the valuation rings O of models (K,O) of an elementary theory Σ of henselian valued fields. As one of the applications we obtain the existence of an \exists \forall-formula defining uniformly the valuation rings O of valued henselian fields (K,O) whose residue class field k is finite, pseudo-finite, or hilbertian. We also obtain \forall \exists-formulas φ_2 and φ_4 such that φ_2 defines uniformly k[[t]] in k((t)) whenever k is finite or the function field of a real or complex curve, and φ_4 does the job if k is any number field. Mathematics Subject Classification: 03C60, 12L12, 12J10 Keywords and phrases: |

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