Expansions which introduce no new open sets

Details Expansions which introduce no new open sets Expansions which introduce no new open sets

2010-02-19

arxiv.org/abs/1002.3762v1

Journal of Symbolic Logic (1) 77 (2012) 111-121

Mathematics

Logic

Scientific paper

We consider the question of when an expansion of a topological structure has the property that every open set definable in the expansion is definable in the original structure. This question is related to and inspired by recent work of Dolich, Miller and Steinhorn on the property of having o-minimal open core. We answer the question in a fairly general setting and provide conditions which in practice are often easy to check. We give a further characterisation in the special case of an expansion by a generic predicate.

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