Carnegie Mellon University
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Remarks on local stability and the local order property

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journal contribution
posted on 1998-01-01, 00:00 authored by Rami Grossberg, Olivier Lessmann
Abstract: "We continue the study of stability of a type in several directions: (1) Inside a fixed model, (2) for classes of models where the compactness theorem fails and (3) for the first order case. Appropriate localizations of the order property, the independence property, and the strict order property are introduced. We are able to generalize some of the results that were known in the case of local stability for the first order theories, and for stability for nonelementary classes (existence of indiscernibles, existence of averages, stability spectrum, equivalence between order and instability). In the first order case, we also prove the local version of Shelah's Trichotomy Theorem. Finally as an application, we give a new characterization of stable types when the ambient first order theory is simple."


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