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Preprint Number 1510

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1510. Luck Darnière (LAREMA), Marcus Tressl
Defining integer valued functions in rings of continuous definable functions over a topological field

Submission date: 30 October 2018


Let K be an expansion of either an ordered field or a valued field. Given a definable set X ⊆ Km let C(X) be the ring of continuous definable functions from X to K. Under very mild assumptions on the geometry of X and on the structure K, in particular when K is o-minimal or P-minimal, or an expansion of a local field, we prove that the ring of integers Z is interpretable in C(X). If K is o-minimal and X is definably connected of pure dimension 2, then C(X) defines the subring Z. If K is P-minimal and X has no isolated points, then there is a discrete ring Z contained in K and naturally isomorphic to Z, such that the ring of functions f ∈ C(X) which take values in Z is definable in C(X).

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Full text arXiv 1810.12562: pdf, ps.

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