Expansions of subfields of the real field by a discrete set

Details Expansions of subfields of the real field by a discrete set Expansions of subfields of the real field by a discrete set

2010-12-16

arxiv.org/abs/1012.3508v4

Fund. Math. 215 (2011) 167-175

Mathematics

Logic

Scientific paper

Let K be a subfield of the real field, D be a discrete subset of K and f : D^n -> K be a function such that f(D^n) is somewhere dense. Then (K,f) defines the set of integers. We present several applications of this result. We show that K expanded by predicates for different cyclic multiplicative subgroups defines the set of integers. Moreover, we prove that every definably complete expansion of a subfield of the real field satisfies an analogue of the Baire Category Theorem.

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