An NIP structure which does not interpret an infinite group but whose Shelah expansion interprets an infinite field

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arxiv 1910.13504 v1 pith:GU5UCFKZ submitted 2019-10-29 math.LO

Erik Walsberg This is my paper

classification math.LO

keywords infinitedescribeexpansionfieldgroupinterpretinterpretsshelah

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Externally definable fsg groups in NIP theories
math.LO 2025-06 accept novelty 8.0 of 10

Every fsg group externally definable in an NIP structure is definably isomorphic to a group interpretable in that structure.