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  1. Positive Model Theory and Amalgamations.Mohammed Belkasmi - 2014 - Notre Dame Journal of Formal Logic 55 (2):205-230.
    We continue the analysis of foundations of positive model theory as introduced by Ben Yaacov and Poizat. The objects of this analysis are $h$-inductive theories and their models, especially the “positively” existentially closed ones. We analyze topological properties of spaces of types, introduce forms of quantifier elimination, and characterize minimal completions of arbitrary $h$-inductive theories. The main technical tools consist of various forms of amalgamations in special classes of structures.
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  • (2 other versions)Complete Theories.Robert L. Vaught - 1960 - Journal of Symbolic Logic 25 (2):172-174.
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  • (1 other version)Quelques propriétés des théories de Jonsson.Yerulan Mustafin - 2002 - Journal of Symbolic Logic 67 (2):528-536.
    On étudie les propriétés des théories de Jonsson et des conditions nécessaires afin que des théories soient de Jonsson ; on caractérise les théories de Jonsson cosémantiques c’est-à-dire ayant un modèle homogène universel commun ainsi que certaines théories complètes contenant des théories de Jonsson. On donne des exemples de certaines situations.
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  • Lovely pairs of models: the non first order case.Itay Ben-Yaacov - 2004 - Journal of Symbolic Logic 69 (3):641-662.
    We prove that for every simple theory T there is a compact abstract theory T.
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  • Positive model theory and compact abstract theories.Itay Ben-Yaacov - 2003 - Journal of Mathematical Logic 3 (01):85-118.
    We develop positive model theory, which is a non first order analogue of classical model theory where compactness is kept at the expense of negation. The analogue of a first order theory in this framework is a compact abstract theory: several equivalent yet conceptually different presentations of this notion are given. We prove in particular that Banach and Hilbert spaces are compact abstract theories, and in fact very well-behaved as such.
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  • Fondements de la logique positive.Ben Yaacov Itaï & Poizat Bruno - 2007 - Journal of Symbolic Logic 72 (4):1141-1162.
    We revisit the foundations of positive model theory, introducing h-inductive sentences. These allow a considerably simplified presentation of positive model theory, as well as a characterisation of Hausdorff cats by an amalgamation property of their h-inductive theory.
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  • (2 other versions)Über eine verallgemeinerung der robinsonschen modellvervollständigung. II. abgeschlossene algebren.Klaus Kaiser - 1969 - Mathematical Logic Quarterly 15 (7‐12):123-134.
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  • Fondements de la logique positive.Itaï Ben Yaacov & Et Bruno Poizat - 2007 - Journal of Symbolic Logic 72 (4):1141-1162.
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  • Über eine verallgemeinerung der robinsonschen modellvervollständigung I.Klaus Kaiser - 1969 - Mathematical Logic Quarterly 15 (1‐3):37-48.
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  • (2 other versions)Über eine verallgemeinerung der robinsonschen modellvervollständigung. II. abgeschlossene algebren.Klaus Kaiser - 1969 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 15 (7-12):123-134.
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  • Fondements de la logique positive.Itaï Yaacov & Bruno Poizat - 2007 - Journal of Symbolic Logic 72 (4):1141-1162.
    We revisit the foundations of positive model theory, introducing h-inductive sentences. These allow a considerably simplified presentation of positive model theory, as well as a characterisation of Hausdorff cats by an amalgamation property of their h-inductive theory.
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  • (2 other versions)Über eine verallgemeinerung der robinsonschen modellvervollständigung I.Klaus Kaiser - 1969 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 15 (1-3):37-48.
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  • (1 other version)Quelques effets pervers de la positivité.Bruno Poizat - 2010 - Annals of Pure and Applied Logic 161 (6):812-816.
    La Logique positive a été introduite au début de ce troisième millénaire par Itaï Ben Yaacov, qui y a été conduit par une nécessité interne à la Théorie des modèles. Dans ce contexte de validité du Théorème de compacité, l’absence de négation provoque des situations inhabituelles, comme celle des structures infinies qui ont une extension élémentaire maximale, que nous étudions ici.
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  • Simplicity in compact abstract theories.Itay Ben-Yaacov - 2003 - Journal of Mathematical Logic 3 (02):163-191.
    We continue [2], developing simplicity in the framework of compact abstract theories. Due to the generality of the context we need to introduce definitions which differ somewhat from the ones use in first order theories. With these modified tools we obtain more or less classical behaviour: simplicity is characterized by the existence of a certain notion of independence, stability is characterized by simplicity and bounded multiplicity, and hyperimaginary canonical bases exist.
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  • Uncountable Dense Categoricity in Cats.Itay Ben-Yaacov - 2005 - Journal of Symbolic Logic 70 (3):829 - 860.
    We prove that under reasonable assumptions, every cat (compact abstract theory) is metric, and develop some of the theory of metric cats. We generalise Morley's theorem: if a countable Hausdorff cat T has a unique complete model of density character Λ ≥ ω₁, then it has a unique complete model of density character Λ for every Λ ≥ ω₁.
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  • Univers positifs.Bruno Poizat - 2006 - Journal of Symbolic Logic 71 (3):969 - 976.
    We define elementary extension and elementary equivalence in Positive Logic.
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  • (1 other version)Several perverse of positivity.Bruno Poizat - 2010 - Annals of Pure and Applied Logic 161 (6):812-816.
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