Journal
MATHEMATICAL LOGIC QUARTERLY
Volume 67, Issue 3, Pages 382-393Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/malq.202100008
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Funding
- National Science Foundation Graduate Research Fellowship Program [DGE-1746047]
- NSF [DMS-1654725]
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This paper addresses several open questions regarding structures with o-minimal open core, presenting examples and constructions to illustrate concepts such as proper expansions, dense function graphs, and Skolem functions within the context of o-minimal structures.
This paper answers several open questions around structures with o-minimal open core. We construct an expansion of an o-minimal structure R by a unary predicate such that its open core is a proper o-minimal expansion of R. We give an example of a structure that has an o-minimal open core and the exchange property, yet defines a function whose graph is dense. Finally, we produce an example of a structure that has an o-minimal open core and definable Skolem functions, but is not o-minimal.
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