Upward Morley's theorem downward

By a celebrated theorem of Morley, a theory T is ℵ1‐categorical if and only if it is κ‐categorical for all uncountable κ. In this paper we are taking the first steps towards extending Morley's categoricity theorem “to the finite”. In more detail, we are presenting conditions, implying that cert...

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Veröffentlicht in:Mathematical logic quarterly 2013-08, Vol.59 (4-5), p.303-331
Hauptverfasser: Sági, Gábor, Gyenis, Zalán
Format: Artikel
Sprache:eng
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Zusammenfassung:By a celebrated theorem of Morley, a theory T is ℵ1‐categorical if and only if it is κ‐categorical for all uncountable κ. In this paper we are taking the first steps towards extending Morley's categoricity theorem “to the finite”. In more detail, we are presenting conditions, implying that certain finite subsets of certain ℵ1‐categorical T have at most one n‐element model for each natural number n∈ω (counting up to isomorphism, of course).
ISSN:0942-5616
1521-3870
DOI:10.1002/malq.201110048