English

On some relations between properties of invariant $\sigma$-ideals in Polish spaces

General Topology 2019-07-23 v1

Abstract

In this paper we shall consider a couple of properties of σ\sigma-ideals and study relations between them. Namely we will prove that c\mathfrak{c}-cc σ\sigma-ideals are tall and that the Weaker Smital Property implies that every Borel I\mathcal{I}-positive set contains a witness for non(I\mathcal{I}) as well, as satisfying ccc and Fubini Property. We give also a characterization of nonmeasurability of I\mathcal{I}-Luzin sets and prove that the ideal [R]ω[\mathbb{R}]^{\leq\omega} does not posses the Fubini Property using some interesting lemma about perfect sets.

Keywords

Cite

@article{arxiv.1907.09306,
  title  = {On some relations between properties of invariant $\sigma$-ideals in Polish spaces},
  author = {Marcin Michalski},
  journal= {arXiv preprint arXiv:1907.09306},
  year   = {2019}
}

Comments

Conference paper: $14^{th}$ Students' Science Conference (2016), Wroc{\l}aw, Poland