The field-type conjecture for NIP expansions by closed sets
Let be an NIP expansion of by closed subsets of Euclidean space. Call field-type when it satisfies condition (1): there is a nonempty open interval and continuous definable operations such that is an ordered field isomorphic to . Field-type conjecture. If interprets an infinite field, then is field-type. The conjecture concerns whether interpreting an infinite field in this tame setting necessarily yields a definable real field on an interval; the paper proves several special cases and notes that the formulation can be changed from interprets to defines under definable selection.
References
Primary source
Erik Walsberg, “Externally definable quotients and NIP expansions of the real ordered additive group”, arXiv:1910.10572 (2020).
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