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Remarks on convergence of Morley sequences

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arxiv 2110.15411 v7 pith:FWOVTC3L submitted 2021-10-28 math.LO

classification math.LO
keywords givemorleysequencestheoremcharacterizationsconvergenceconvergentcorollary
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abstract

We refine results of Gannon [G21, Theorem 4.7] and Simon [S15a, Lemma 2.8] on equivalences of convergent Morley sequences. We then introduce the notion of eventual $NIP$, as a property of a model, and give a variant of [KP18, Corollary 2.2]. Finally, we give new characterizations of generically stable types (for countable theories) and reinforce the main result of Pillay [P18] on the model-theoretic meaning of Grothendieck's double limit theorem.

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