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Positive Jonsson theories. (English. French summary) Zbl 1456.03060

Summary: This paper is a general introduction to Positive Logic, where only what we call h-inductive sentences are under consideration, allowing the extension to homomorphisms of model-theoric notions which are classically associated to embeddings; in particular, the existentially closed models, that were primitively defined by Abraham Robinson, become here positively closed models. It accounts for recent results in this domain, and is oriented towards the positivisation of Jonsson theories.

MSC:

03C95 Abstract model theory
03C07 Basic properties of first-order languages and structures
03C10 Quantifier elimination, model completeness, and related topics
03C52 Properties of classes of models
Full Text: DOI

References:

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