English

The onto mapping property of Sierpinski

Logic 2014-08-14 v1

Abstract

Define (*) There exists (ϕn:ω1ω1:n<ω)(\phi_n:\omega_1\to \omega_1:n<\omega) such that for every uncountable II which is a subset of ω1\omega_1 there exists nn such that ϕn\phi_n maps II onto ω1\omega_1. This is roughly what Sierpinski in his book on the continuum hypothesis refers to as P3P_3 but I think he brings reals number line into it. I don't know French so I cannot say for sure what he says but I think he proves that (*) follows from the continuum hypothesis. We show that the existence of a Luzin set implies (*); and (*) implies that there exists a nonmeager set of reals of size ω1\omega_1. We also show that it is relatively consistent that (*) holds but there is no Luzin set. All the other properties in this paper, (**), (S*), (S**), (B*) are shown to be equivalent to (*).

Keywords

Cite

@article{arxiv.1408.2851,
  title  = {The onto mapping property of Sierpinski},
  author = {Arnold W. Miller},
  journal= {arXiv preprint arXiv:1408.2851},
  year   = {2014}
}

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Latest version: http://www.math.wisc.edu/~miller/res/sier.pdf