First-order definitions of rational functions and S -integers over holomorphy rings of algebraic functions of characteristic 0

Annals of Pure and Applied Logic 136 (3):267-283 (2005)
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Abstract

We consider the problem of constructing first-order definitions in the language of rings of holomorphy rings of one-variable function fields of characteristic 0 in their integral closures in finite extensions of their fraction fields and in bigger holomorphy subrings of their fraction fields. This line of questions is motivated by similar existential definability results over global fields and related questions of Diophantine decidability

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