A model with no magic sets

Details A model with no magic sets A model with no magic sets

1998-01-15

arxiv.org/abs/math/9801154v1

Mathematics

Logic

Scientific paper

We will prove that there exists a model of ZFC+``c= omega_2'' in which every M subseteq R of cardinality less than continuum c is meager, and such that for every X subseteq R of cardinality c there exists a continuous function f:R-> R with f[X]=[0,1]. In particular in this model there is no magic set, i.e., a set M subseteq R such that the equation f[M]=g[M] implies f=g for every continuous nowhere constant functions f,g:R-> R .

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