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Preprint Number 865
865. Michael C. Laskowski, Christopher S. Shaw
Definable choice for a class of weakly o-minimal theories
Submission date: 8 May 2015.
Given an o-minimal structure M with a group operation, we show that for a properly convex subset U, the theory of the expanded structure M'=(M,U) has definable Skolem functions precisely when M' is valuational. As a corollary, we get an elementary proof that the theory of any such M' does not satisfy definable choice.
Mathematics Subject Classification: 03C64
Keywords and phrases: model theory, Skolem functions, definable choice, o-minimal, weakly o-minimal
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