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arxiv: 1607.07833 · v1 · pith:IMLPZBNEnew · submitted 2016-07-26 · 🧮 math.LO

The Number of Atomic Models of Uncountable Theories

classification 🧮 math.LO
keywords alephatomicmodelssizecompleteconstructiblelanguagetheory
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We show there exists a complete theory in a language of size continuum possessing a unique atomic model which is not constructible. We also show it is consistent with $ZFC + \aleph_1 < 2^{\aleph_0}$ that there is a complete theory in a language of size $\aleph_1$ possessing a unique atomic model which is not constructible. Finally we show it is consistent with $ZFC + \aleph_1 < 2^{\aleph_0}$ that for every complete theory $T$ in a language of size $\aleph_1$, if $T$ has uncountable atomic models but no constructible models, then $T$ has $2^{\aleph_1}$ atomic models of size $\aleph_1$.

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