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

Abstract

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

Conference paper: $14^{th}$ Students' Science Conference (2016), Wrocław, Poland