On canonical bases and internality criteria

Details On canonical bases and internality criteria On canonical bases and internality criteria

2007-05-28

arxiv.org/abs/0705.4078v1

Mathematics

Logic

13 pages

Scientific paper

A criterion is given for a type in a finite rank stable theory to be (almost) internal to a given nonmodular minimal type. The motivation comes from results of Campana which give criteria for compact complex analytic spaces to be algebraic (namely Moishezon), in terms of the existence of "generating" families of algebraic subvarieties. A model-theoretic anologue/generalisation of Campana's results is given under the hypothesis that the theory has the "canonical base property" (CBP), a property that is conjectured to hold in all stable finite rank theories and which states that the type of the canonical base over a realisation is almost internal to the minimal types of the theory.

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